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)

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23
votes
1answer
7k views

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 ...
24
votes
6answers
17k views

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 ...
19
votes
3answers
30k views

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 ...
11
votes
3answers
10k views

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 ...
24
votes
4answers
13k views

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 ...
10
votes
6answers
36k views

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 (...
11
votes
6answers
851 views

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 ...
16
votes
1answer
12k views

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 ...
3
votes
1answer
1k views

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.
7
votes
1answer
9k views

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 ...
8
votes
3answers
2k views

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 ...
5
votes
1answer
17k views

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. ...
2
votes
1answer
4k views

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.?
10
votes
3answers
5k views

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 ...
8
votes
1answer
9k views

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!
5
votes
2answers
920 views

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 ...
18
votes
5answers
5k views

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 ...
17
votes
4answers
22k views

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 ...
0
votes
2answers
2k views

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 ...
5
votes
2answers
13k views

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 ...
4
votes
1answer
2k views

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 ...
9
votes
1answer
2k views

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
votes
2answers
1k views

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 ...
2
votes
1answer
239 views

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 ...
8
votes
1answer
1k views

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 ...
6
votes
2answers
1k views

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 ...
3
votes
3answers
2k views

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 ...
1
vote
2answers
1k views

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 ...
0
votes
1answer
540 views

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 ...
6
votes
2answers
3k views

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 ...
8
votes
4answers
4k views

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. ...
6
votes
1answer
107 views

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 ...
6
votes
1answer
3k views

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 ...
1
vote
1answer
2k views

Blender selection in viewport suddenly slow

Since a few weeks I suffer from the issue where I have to wait up to 6 sec after selecting an object in the viewport. The time depends on the amount of hidden layers (and hence the amount of objects ...
6
votes
2answers
9k views

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 ...
5
votes
4answers
11k views

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 ...
2
votes
1answer
784 views

Do high end cards have better rendering performance?

A lot of times I try to render meshes with millions of polygons in a scene, and the performance is exremely slow. I tried using CUDA but without luck. I'm using a GeForce gtx 960, 10GB Vram, and have ...
0
votes
1answer
7k views

What are the best graphics cards for cycles? [closed]

I'm considering having a system build solely for rendering for cycles (as kind of a single PC renderfarm). Since the GPUs would be most important here, I plan on having it build around those. I was ...
7
votes
1answer
911 views

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 ...
5
votes
2answers
450 views

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 ...
3
votes
1answer
2k views

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
2
votes
2answers
889 views

Is the VSE multi-threaded?

So I am thinking of doing an AMD build with the fx-8370 and want to use Blender's video editing component for video editing but I do not know if it will utilize all eight cores. Should I look to ...
2
votes
1answer
6k views

How much space does Blender take up on a computer?

I've been considering downloading Blender, but am unsure how much space it'll take up on my computer's memory. Thanks to anyone who can help answer this question!
2
votes
0answers
237 views

Creating/Handling pathfinding large world waypoints in Blender

I am trying to create an importer/exporter script for an open world's game map. However, I am being constantly hit and set back by performance of blender. I want to be able to create way points for ...
1
vote
2answers
2k views

What does the Render and Preview of the Samples section do?

Yesterday, i put my animation to render, it went fine. But one thing that bothers me is: What is the Render and Preview? I actually discovered that the Render is something like the quality, so i keep ...
1
vote
1answer
2k views

What will speed up renders more effectively?- more cores or higher clock speed? [closed]

I am contemplating between the AMD FX6300 and AMD FX4350, the former being 6-core@3.5GHz and the latter being 4-core@4.2GHz http://www.cpu-world.com/CPUs/Bulldozer/AMD-FX-Series%20FX-4350.html http:/...
0
votes
2answers
4k views

Why is Blender just using 54% of my CPU when rendering in cycles?

Blender is only utilizing 54% on every core of my CPU (as shown in TaskManager) when rendering in Cycles. How can I make it use 100%? Can this be fixed within Blender or is it more of an OS/hardware-...
0
votes
1answer
396 views

Horrible scene_update_post performance

Since the Python API does not support events when objects are removed I had to go a pretty "uncomfortable" way to visualize contents of a game level to which I write an addon. The game places ...
0
votes
1answer
109 views

Cycles Render CPU Usage Low with Dual Xeon

low CPU usage on Dual Xeon (128GB RAM) when rendering "blenderman" using command line and Cycles on Ubuntu and Win10. Using latest 2.8 build. Single i7 3rd Gen gets upto 100% using GUI and CMD on ...
-3
votes
1answer
1k views

How can I get faster render times for a single image? [closed]

When rendering a single frame, either by pushing F12 or from the Properties → Render menu, is there any way to speed up the process? I know about rendering animation through the Python console to ...