Questions tagged [performance]
Questions pertaining to software performance or computational speed of Blender should use this tag. (Do not ask hardware specific questions. They are considered off-topic)
77
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Python performance with Blender operators
In my script, I have for loop over many cube objects (~1000) and the treatment is very slow. Looking more in details, I notice that in the same amount of loops:
if ...
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26
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7
answers
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How to make VSE render faster?
I'm putting together a video from the VSE. In the sequencer window it is rendering and scrubbing at near realtime yet during output it is taking around 3x longer.
The frames are taking 0.13 seconds ...
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19
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3
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How will multiple GPUs improve Cycles' rendering performance?
I have an NVIDIA Titan GPU and I'm able to add another card, but I wonder whether Blender will benefit from more than one GPUs?
Should I do it as SLI or should I just do it as an added card? I just ...
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18
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8
answers
3k
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How to find the number of loose parts with Blender's Python API?
I want to find out how many loose parts a mesh has using Python, i.e. write a function that takes a mesh object as an argument and returns an int. So far I haven't found a way to access this ...
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13
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3
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14k
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Why is rendered viewport faster than rendering individual frames?
When I'm using rendered viewport it initially takes a while before rendering starts, but once it does, I can freely move around and rendering a new view happens almost instantaneously. When on the ...
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5
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How to configure blender so that it uses only 50% of total CPU when rendering?
I need to render a very computer-intensive scene using cycles and for some reasons, I decided to use my home computer (i5 3.30 Ghz, 10 GB RAM, 2TB Hard Drive) to render it. However, the problem is ...
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20
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1
answer
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What does static/dynamic BVH do?
In the render properties panel, under the performance rollout there is a setting for static vs. dynamic BVH. I am simply wondering what this setting does.
From the Wiki:
The raytracing ...
- 25k
4
votes
1
answer
5k
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What computer should I buy for Blender? How do I choose hardware? [closed]
I’m using a Mac Book Pro but from what I understand Blender doesn’t work well with any Apple computers?
I’m looking at PC options to use specifically with Blender.
How do I choose a computer to use ...
user92201
3
votes
2
answers
2k
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Copying an object with python without actually creating a new object
I ran across this script on another forum and would like to implement it. However, I'm running into a major bottle neck (performance-wise) when it gets to linking the new objects back to the scene ...
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24
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4
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Cycles hybrid rendering
The Cycles render engine can render both on the CPU and the GPU. I often render over-night so I do not need my computer to be responsive.
Is it possible to render with Cycles using both the CPU and ...
user320
10
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6
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44k
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Best Tile Size for Blender Internal Renderer and Cycles
There've been a few discussions about tile sizes for Cycles, but none that I can find about that of BI. Since it renders with the CPU, does it follow the same rule as cycles where smaller is better (...
9
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1
answer
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What is Clamp Direct/Indirect?
What does the "Clamp Direct" and Indirect values mean? I may seem silly but i'm really new to blender. Could you please tell me what are they useful for? Thanks!
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3
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Managing/Reducing noise in a night scene
I've been trying to get a pretty noise free image from this scene for a while. And nothing seems to be working. I've been trying to use 3000 samples, then rendering different noise seeds and composite ...
- 209
3
votes
1
answer
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Why does cycle rendering only use one core from an AMD GPU?
I am using Blender 2.77 and an R7 250 GPU on Windows.
Compute Device >> OpenCL (Oland).
OpenSubdiv >> (Tested with all).
Device >> GPU Compute.
5
votes
1
answer
30k
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Why is my render taking so long?
My interior is rendering almost two hours and it shows only 2 samples that have been rendered. I don't quite know how to select properly those render settings to make good quality interior scene.
...
- 73
2
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1
answer
4k
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General system specs for large scenes in blender [closed]
What are the system requirements for working with complex geometry in Blender? Things like RAM, GPU, CPU etc.?
12
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3
answers
9k
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Is Physics calculation multithreading possible?
Is there a way to turn on multithreading to make use of all of my computers cores for simulations? I am running on a monster of a machine, but without utilizing all of the cores, physics simulations ...
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9
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1
answer
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Is it possible to use different CUDA-capable graphic cards to render simultaneously?
I know that you can't mix different spec cards for SLI gaming, but I suspect that when it comes to 3D rendering, the renderer will simply divide the work up automatically.
Choosing the optimum tile ...
5
votes
2
answers
2k
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Maximum number of materials that can be added in a scene?
I have very large number of planes in my scene and each needs to be assigned a color, and to do that, I am assigning a material to each plane. Blender is allowing 2^15, i.e. 32768 materials. But the ...
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21
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5
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Why/how does tile size effect performance?
The general wisdom is "for CPU use 32x32 tiles, for GPU use 128x128 or bigger, depending on your card". But why?
Why should a ...
- 25k
7
votes
1
answer
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Blender Cycles Slow Rendering Interior Scene
I have create a very basic blender scene with Suzanne and a modified cube with no UVs and only basic materials. The scene contains about 3 emissive lights.
Using the cycles rendering engine, when ...
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4
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1
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VSE: How to Speed up the Preview of Image Strips?
The Issue
Is there any way to speed up the preview of image strips in the video sequence editor? Unfortunately, the preview in the VSE is very choppy and indicates that it runs at only a few frames ...
- 283
1
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1
answer
171
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Does decimate an object helps cycles rendering faster in blender?
Does decimate an object helps cycles rendering faster in blender?
If we decimate the object and use smooth shading, will it render faster specially in those scenes where lightning matters the most?
0
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2
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Multi-core/threaded particle simulations
Recently did a liquid splash via Gleb Alexandrovs tutorial.
So smoke + flow field + particles + meta-balls to get some sort of fluid splash going on.
Where I noticed, none of these processes are able ...
9
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1
answer
3k
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How to efficiently instantiate object with memory-hungry modifiers?
Using Alt + D to duplicate light meshes with heavy modifiers (like a leaf with a particle instance modifier or a trunk with a subdivision modifier) can lead to huge memory usage. Because only the base ...
- 2,811
8
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1
answer
2k
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Working with high polycounts?
I'm importing meshes to do some retopologisation on but blender just can't handle it without me having some sort of quadro card. Do I have to use mudbox or something similar to do work with such poly ...
- 313
7
votes
3
answers
2k
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Faster blur effect in Blender VSE
Blender's Video Sequence Editor allows you to use the Gaussian Blur effects strip to blur the image or video, however, it uses a lot of CPU and the rendering is slow like a hell. It takes around 2 ...
6
votes
1
answer
736
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Saving blend-files straight to server nets 0.5% speed of a windows file copy, how to fix?
Some context:
Part of our company (about 3 fulltime people) do ArchViz, we're using Blender 2.79b and are transitioning to Blender 2.8. Tests underneath were done using 2.8. I'm not an artist myself ...
5
votes
2
answers
16k
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How can I improve viewport performance when using Dyntopo?
I'm doing a Blendercookie course on how to sculpt a Scifi weapon with dyntopo. The fact is that when some piece reach a certain level of compleiity (about 1.1 million tris) the systems starts to lags ...
3
votes
3
answers
2k
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Poor performance with h.264 VSE
Sorry if this is a noob question but I started using Blender today as a free video editor and now that I'm rendering my project, it's taking a lot longer than I was expecting.
The project is ...
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3
votes
2
answers
6k
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Low FPS Blender(viewport)
Started using blender, FPS was great, but the UI was flickering. Googled, I didn't have an opengl32.dll in the directory, then added it. UI Flickering gone, but FPS dropped drastically.
Would like ...
- 31
3
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2
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How is real-time rendering different in blender from game engines?
Real-time rendering is the key feature of game engines like Unity and Unreal. Although advanced rendering by Cycles should take a while, I think Eevee should be able to deliver real-time rendering.
I ...
- 141
3
votes
1
answer
385
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rendering frame with image save every .... ( 100?) samples
For a project I'm working on I want to do some test renders to see how many samples I would need for the final image. I want to do this as time efficient as possible so I was wondering if there is any ...
- 114
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Laggy viewport in 2.9 when model has a lot vertices
I an trying to figure out why blender can be super laggy and slow on my high end pc.
The lagg only happens with certain objects. probably because it has a lot of vertices (248k).
If I go in edit mode,...
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vote
2
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2k
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What is the fastest way of creating a large mesh/object built from smaller mesh "building blocks"
I realize similar questions have been asked before and I followed the advice given there but I hope to gain more insight on the matter here.
I've added a lot of details, I hope it's not too much.
I ...
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0
votes
1
answer
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Blender running at a crawl after NVidia update
I can’t say exactly the NVidia update was the cause but several other people and I have experienced a problem with Blender slowing to a crawl in the last few days. If you are having this same problem ...
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1
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Dual GPU doesn't speed up rendering in Cycles
A few days ago I finished a build, including two Titan XP.
The goal was to get faster rendering, letting the gpus work as two seperate cores that render two chunks at the same to nearly double the ...
- 3
12
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2
answers
2k
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Optimize cycles background rendering
Is there any trick to increase performance in background-only tiles in cycles. As you can see in the pictures, an empty render takes more than one minute. When you render motion graphics animations, ...
- 1,406
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6
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What are the pros and cons of using Blender on Windows or Linux?
Is Blender more stable on some Linux distributions, or just on Linux at all? I am contemplating dual-booting my computer and partition some of my HDD for Linux to use blender there. Would there be any ...
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8
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4
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Blender becomes very slow with large amount of objects sharing mesh data
In my script I am importing a large amount of objects (+2500) but sharing the mesh data from one single primitive. While this has taken care of importing speed, it completely slows blender down. ...
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1
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How to display calculation time above nodes?
I was watching a video tutorial in which the author has his Geometry Nodes looking like this (screenshot):
Notice the 0.17ms and ...
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7
votes
2
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Blender Global undo is very slow on complex scenes
When I'm working with complex scenes (a few million polygons with +- some subdivision), say you're making a weapon highpoly model, the Blender's Global Undo becomes extremely slow.
Even with simple ...
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OpenCL vs CUDA Rendering
Nowdays I have the old Radeon HD 6870, and it's not compatible with OpenCL, so the rendering is made by the CPU, that is a quite slow comparing with GPU rendering.
I'm thinking on a upgrade to R9 380 ...
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7
votes
1
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Render FPS is low
I looked at the other questions about this, but I'm finding no solution. Partly because I have the newest blender version, 2.76. I am playing my animation back, and it plays around 5 fps. I am using ...
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2
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656
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Does Cycles use a Camera Frustum check?
So, in a random tutorial (I can't find it atm) Andrew Price mentioned that Cycles will render all geometry/particles, even if they are not visible to the camera; This suggests that Cycles doesn't use ...
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4
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2
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2k
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How can I get the number of vertices/triangles per object?
I'm working on a scene that's getting complex: I have 30 objects for a total of about 5 million triangles. I start to be concerned about performance.
I would like to know which of the objects ...
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3
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1
answer
836
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Performance ?, which is better, taking a 4k image and splitting it up, or using material with full 4k image and changing the texture coords?
I have read variations of this question in the past, but often times those questions had more to do with how to also split up a model, and this variation does not.
I have a set of 4k PBR textures (...
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3
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1
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2k
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Settings to make viewport playback drop frames in order to keep up with actual animation speed?
I'm animating a character in 24 fps, but my computer is only able to playback at 20fps at the most in this scene, so when I play the animation in the viewport it's actually much slower than it should ...
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3
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2
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379
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Python performance without Blender operators
After reading some posts here, i try to avoid using operators in order to avoid useless scene.update slowdown.
Unfortunatly i still have a slowdown when creating multiple objects in blender, here is ...
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votes
1
answer
2k
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My CPU is still faster than my GPU
When I render something with blender my CPU is faster than my GPU. Why is that?
My GPU is Nvidia Geforce GT730 2gb and my CPU is intel i5
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