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)
457
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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 ...
- 757
26
votes
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 ...
- 815
24
votes
4
answers
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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
21
votes
5
answers
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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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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
20
votes
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
19
votes
3
answers
49k
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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 ...
- 291
18
votes
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 ...
- 283
16
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1
answer
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Why is my cycles render still grainy on 1000 cycles?
I recently made a desk lamp model and set the samples to 1000 for an overnight render upon waking up the image was still rather grainy is this something in my blender that isnt set right or something ...
- 381
13
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1
answer
17k
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What's the difference between the various Open Subdiv compute types?
It seems there are 5 different available "compute types". what are these compute types? What's the difference between them?
- 12.3k
13
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3
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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 ...
- 2,388
12
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3
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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 ...
- 899
12
votes
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
11
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5
answers
24k
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Should I wait when Blender isn't responding?
By error I placed the angle of the smart uv unwrap to 1 and now Blender is not responding. I guess it calculates the uv. The problem is that I have a lot of unsaved changes on the mesh.
Should I wait ...
- 113
10
votes
6
answers
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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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6
answers
27k
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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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9
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3
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How can I tell if Blender is using all 64 GB of RAM?
I have 64GB of RAM on my computer and I'm trying to check if Blender is using all that it can.
I still get viewport slowdown at times when working with complex objects. I know there are many ...
- 291
9
votes
1
answer
14k
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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 ...
9
votes
1
answer
22k
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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!
- 115
9
votes
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
9
votes
2
answers
520
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Performance of mixing colors vs mixing colored shaders
Is there a performance difference between these two setups?
I imagine on a material this simple, there's not going to be much of a difference. But on a complex material, it could. If you had a choice ...
- 6,469
8
votes
5
answers
7k
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Is it possible to render a movie on a single computer in blender?
Is it possible to render a fairly graphical movie on a decent gaming-computer, with a GTX graphics-card, 4 2 GHz core CPU and 8 GB of RAM, or do you need to have a gigantic rendering-farm like Disney?
...
- 89
8
votes
4
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6k
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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. ...
- 399
8
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3
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4k
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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
8
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2
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4k
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What are the advantages of turning on "cache BVH"?
What are the advantages of turning on cache BVH for a cycles render?
Not sure how to elaborate. I'm not necessarily looking for a technical description, just a better idea for when to use it, and ...
- 11.1k
8
votes
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
8
votes
2
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1k
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How can I prevent blender from doing ridiculously large calculations?
Occasionally I end up using a metaball. If I scale the main metaball, it changes the resolution. The smaller it gets, the high resolution it becomes. If you press S to make it bigger and you ...
- 2,211
8
votes
1
answer
1k
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Cycles Renderer - Updating Shaders and Images Every Frame?
This question is more of a curiosity to the potential of increasing render times, however, after finding very little out about this anywhere else, I am thinking it may be an intentional feature.
I am ...
- 81
7
votes
2
answers
9k
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Are there any ways to speed up blender compositor?
I have switched companies for a while, while in my last company we where using Fusion for compositing, in the new one we are using Blender.
I find it a bit hard to transition because of 2 main ...
- 73
7
votes
2
answers
664
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Need Technique for Projecting Countries onto the Earth
I've got a project I'm on where I must project some shapefile generated country surfaces onto a globe. Here's where I am currently...
Now, the shapefiles I used have excellent vertex resolution about ...
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1
answer
2k
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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 ...
- 18.8k
7
votes
2
answers
7k
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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 ...
- 196
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 ...
- 339
7
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3
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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 ...
7
votes
1
answer
1k
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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 ...
- 417
7
votes
2
answers
603
views
Are there any disadvantages to starting blender with the --enable-new-depsgraph argument?
The question says it all :). I'm asking because it solved the latency problem between parents and children in the viewport and I will use this as the default blender starting argument (blender --...
- 1,153
7
votes
2
answers
13k
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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 ...
- 193
7
votes
1
answer
5k
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Does Blender have a way to reduce texture size?
I have several objects, each with 1024x1024 textures on them. I want to reduce that to just 64x64 per object, for performance reasons (I'm planning on having a lot of these objects).
I'm not worried ...
- 2,572
7
votes
1
answer
3k
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Turn physics proccesses off and on?
Is there an easy way to, while keeping all of the physics settings the same, turn off the physics processing? Essentially, I have a huge scene with a ton of physics and I'm not ready to bake it yet ...
- 899
6
votes
1
answer
735
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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
656
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 ...
- 12.3k
5
votes
1
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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.
...
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5
votes
2
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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 ...
5
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4
answers
3k
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Reducing viewport slowness while working on a .blend with lots of particles?
I wonder to know if there is a way to dramatically reduce blender slowliness while working on a .blend with lot of objects/particles on a slow PC.
I'm using BI.
I'm looking for more tricks than the ...
- 155
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 ...
- 365
5
votes
1
answer
167
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Geonodes: which is faster, Set Position or Transform node?
Not sure if BSE is a good place for such benchmarks, feel free to let me know with downvotes (question downvotes are free).
Since many operations can be done by both, which of the two should be ...
- 31.6k
5
votes
1
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3k
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Screen lag during GPU rendering
GPU rendering causes some screen lag while rendering, with the amount depending on how heavy the render is. I understand this is due to the display driver being busy.
What I don't get is why it ...
- 6,469
5
votes
1
answer
995
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Which is more efficient? duplifaces, particles, or group instances?
Particles give more controls for doing things like randomizing rotation of instances, but duplifaces and group instances allow for rotation and scale of individual instances.
For something like ...
- 156k
4
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1
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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
4
votes
4
answers
5k
views
How to disable entire tracks (or multiple clips) in VSE
I'm using Blender to do the video editing for one of my projects. The interface is somewhat counter-intuitive, but I use it because it gives me crazy amounts of control and it's very dependable. I'm ...
- 3,342