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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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540 views

Background rendering OS X

Is there an effective way of running Blender Cycles rendering in the background without hogging all of my iMacs resources and making basic desktop usage (i.e. Web browsing) completely impractical? I'...
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1answer
589 views

Raycast performance

I need to raycast many points (up to 10k points) in BGE with python, and the performance is poor. Reduce the range and polygon count improves slightly, but still far from ideal. I would get 10 frame ...
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1answer
305 views

Animation Nodes Loop Performance

I'm using static parameters in Loop Subprograms. Setting up these parameters let's me modify the node tree easily, but I noticed, that I never change the inputs. I would like to move unnecessary ...
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2answers
291 views

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 ...
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2answers
7k views

Cycles is painfully slow even for the simplest of scenes

Google shows that Blender's slow rendering has been questioned numerous number of times before too, but in my case it has gone to a degree that rendering even the simplest things requires ages. I'm ...
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1answer
539 views

CPU vs CUDA performance differ in render and rendered display

Blender 2.78a on archlinux (FX-8320 @ 4.4GHz, GTX1060) Rendering times for RyzenGraphic_27.blend from amd website: CPU - 0:58 CUDA - 1:20 Live rendering times ...
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37 views

Does it seem like I'm using more memory than necessary?

I'm super new to Blender, and I've been trying to model this Bose speaker to get started: So far, I've made the base, extruded it, and then used proportional editing with scaling to make it wider in ...
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1answer
434 views

BI: is background (CLI) rendering faster?

I had a long (by my standards) render running and got frustrated, decided to do it via the CLI in the background while I work on other stuff. To my surprise the time per frame seems lower when the ...
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1answer
6k views

Blender slow response and lag? [duplicate]

So this what happens, at first blender plays nice, no lag and fast response using the .zip installer. Then I decided to make a new partition for my 3D works and programs and this where it start to ...
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1answer
269 views

Blender on Second Monitor suddenly lags

I run a 3 monitor setup. I'm on windows 7 with 3.4ghz quad core, 32gig RAM, Titan GTX, and 770. My primary monitor is on the Titan, and the secondary 2 monitors are on the 770. I have been used to ...
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1answer
344 views

Performance issues with new laptop [duplicate]

I recently purchased a gaming laptop (Lenovo Ideapad Y700) with a quad-core 64-bit i5 6300HQ CPU (2.2-3.2 GHz, 6MB cache) with an integrated Intel HD Graphics 530 GPU, 8GB 2133MHz DDR4 RAM, and a ...
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1answer
522 views

Why does render resolution affect RAM use?

I am trying to understand all the factors that effect RAM use so I can get the most out of my graphics cards VRAM when rendering. I understand that the amount of geometry and the resolution of ...
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1answer
391 views

How to speed up modifiers?

In my model I use a couple of difference modifiers for some meshes to achieve complex surfaces or simple holes, the problem I have is Blender becomes stressed about it very quickly. Every change to ...
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0answers
43 views

Recurring issue, Can anyone help me fix Blender hanging before the file browser appears?

I have been using Blender for a little over five years now and just recently it has started to freeze up or hang whenever I click any button that activates the file browser. Whether it be browsing for ...
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2answers
2k views

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 ...
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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-...
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0answers
521 views

Performance issues with blender VSE preview during effects only

My system information: Operating System - Windows 10 (64 bit) CPU - i7-5930K @ 3.50GHz RAM - 32GB DDR4 (4x8GB) GPU - AMD R9 Fury X Storage - PCI-e SSD OCZ Revodrive (500 MB/s writes, 900 MB/s reads) ...
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1answer
3k views

Cpu vs gpu vs ram rendering in blender [closed]

I have an Intel Core2Duo e7400 processor, 3 GB ram, 120G SSD hard drive, and an nVidia Geforce 750Ti 2GB graphics card. When i gpu render vast scenes of about 100MB using Cycles in Blender, I receive ...
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1answer
242 views

model flickers when I rotate the view

In my default startup .blend file, whenever I rotate the view, the cube flickers and duplicates like there are two of them. Watch this video to see what I'm talking about.
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3answers
5k views

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 ...
3
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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
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2answers
515 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 --...
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1answer
305 views

Why does Blender slow down when I duplicate a model repeatedly?

Why does Blender slow down when I duplicate a model repeatedly, as in the above screenshot?
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2answers
351 views

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 ...
2
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1answer
780 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 ...
2
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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 ...
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1answer
331 views

Speeding up hair editing

The first time I saw the hair system in blender, I was able to style it in the particle editing view without much of a problem. That was on a cheap laptop. Now I'm working on a system with two bridged ...
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1answer
394 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 ...
2
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1answer
500 views

Minimizing unnecessary edge loops

I'm modeling assets for a game and want to keep the polygon count to a minimum. One problem I've run into is having unnecessary edge loops on one part of a mesh that are necessary for a different part ...
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3answers
643 views

Blender for Beginners [closed]

My nephew seems interested in doing 3d and all the great things Blender can do. I've done enough in Blender to love it. But I can't afford a $4000 computer specified, especially not knowing if his ...
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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 ...
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1answer
311 views

Boolean Union Modifier Disappearing Components

I have seen similar questions regarding this issue, but this seems a little odd. Whenever a Boolean Modifier is used between two components, everything disappears. Although whenever I scale both ...
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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 ...
2
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1answer
360 views

Does Blender create large cached files on Mac computers?

I am still new to Blender (less than 1 year), and have read this post indicating that Blender sometimes creates large cache files. The user - and thread - are regarding the use of Blender on a non-...
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1answer
902 views

Long render times for a nature scene?

I created a nature scene and everything was fine until I tried to render it. I set about 600 samples (quite low) and hit render. I let it sit over night, but when I got up, I saw 6 hours left (even ...
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0answers
104 views

Play Rendered Animation CPU Consumption

How can I use the feature [Play Rendered Animation] without excessive CPU Consumption? When I use play rendered animation the CPU often is consumed excessively. I am not rendering at this time. ...
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2answers
333 views

Beginner: Wrong workflow? 8x8x8 LED Cube to complex

Total beginner here - I hope you guys can help me :) So I want to make a 3D representation of my LED Cube. It consists of 512 LEDs (8x8x8). I think it should be pretty simple... So I started reading ...
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1answer
281 views

Can viewport playback be improved by moving elements to other layers?

I am currently working on project that is made entirely of 2-D elements, images-as-planes. I have the whole scene on one layer right now and the viewport playback speed has slowed down badly. I have ...
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0answers
811 views

Cycles renders slow

I have an animation with 500 frames at 1280x720 resolution. It is a low-poly style scene with 108k. The average time for one frame is 3 minutes at 50 samples. I tried to enable GPU compute with a ...
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2answers
470 views

How to set keyframe handles to be interpolated via script on the fly (low-level variant: keyframe_points.add(int) + keyframe_points[i].co=..)?

When I do this in a script, both left and right handles begin at the (0.0, 0.0) point, so the animation curve looks like this: Handles fix themselves if I do sth, like dragging just one of them. ...
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2answers
861 views

Slower Cycles Render on Faster Computer

I'm rendering the exact same file in Blender on two computers. It's an animation (here's a frame) I'm using the network rendering placeholder and non overwrite functions to render individual frames ...
13
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1answer
16k views

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?
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2answers
20k views

What is fastest, rendering on a CPU or a GPU?

For Christmas my parents gave me a new graphic card. Even though I got a new card (R9 390), the rendering times are really slow. I am asking if I should get another card instead or perhaps its better ...
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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 ...
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0answers
228 views

Cache slow animation?

Let's say I have an animation that my computer can only process at an incredibly slow rate (A forest, for example). Is it possible to cache the animation so I can work with it (and only have to ...
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0answers
70 views

Weird bmesh performance when creating new vertices

I have 2 different meshes with roughtly the same amount of faces/verts. In the first case I only have 1 object in blend file, in second case around 80. This is the only difference I can think of, in ...
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4answers
3k 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 ...
7
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1answer
2k views

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 ...
7
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1answer
910 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 ...
2
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1answer
814 views

Does Cycles support all (relatively new) CUDA GPUs?

Are there any limits on the CUDA GPUs that Blender will support (besides really old ones)? I thought I heard somewhere that Blender doesn't support workstation class (NVIDIA Quadro) GPUs. But I have ...