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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How to make performance test while render my scenes

I want to do a performance test via scenes that I created. Could you give me some tips or applications which will check performance in the blender? GPU, CPU, Memory usage? Or maybe it's possible to ...
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123 views

Does Blender bloat unnecessarily the Windows Registry?

According to Revo Uninstaller, Blender adds more than 4400 registry keys to the Windows Registry. They are almost all spread in Registry folder: ...
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50 views

low framerate and crashes in the viewport by using not even up to 30% GPU and CPU

Hello im new in blender and wana ask is that normal by my PC that it this scene if i play it for the first time i got 1 to max 15 fps . And my GPU and CPU usage is not even by 30% . And if i for ...
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5k views

Poor performance on mac with AMD Radeon Pro 560

My mac is a macbook pro 2017, with AMD Radeon Pro 560. Seeing this question How to do GPU rendering on MacBook Pro 2016 (AMD Radeon Pro 460) I also get the Cycles render to work, but it renders at ...
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Desktop GTX 1070 barely faster than GTX 1050-Ti mobile in cycles

I'm rendering 10 frames of a scene both on a Dell XPS 15 Notebook and my Desktop PC. Desktop: i5-2500K + GTX 1070 8GB Notebook: i7-8750H + GTX 1050-Ti mobile Desktop: CPU (i5-2500K): 2:34 min GPU ...
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15 views

Blender 2.8 cannot save document, or cannot re-open a document (sculpting) and crashes my whole computer

I run Mojave 10.14.6, 8 GB My downloaded Blender 2.8 from the blender 's website two weeks ago. It seems rather random. In sculpting mode, some files suddenly won't save. Instead the program freezes ...
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1k 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 ...
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127 views

Blender 2.8 general frame lag

With the recent release of Blender 2.80, I was expecting it to be as polished and lag free as 2.79b I guess I set my expectations a little too high cause I'm disappointed it still feels like it's in ...
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25 views

how can i improve script execution time

Is it there a control or something to assign more resources to script execution. Or the only option is to improve script's code performance?.
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191 views

No render speed difference in Eevee cpu vs gpu

My gpu got damaged last night so I removed it and started using blender with cpu only. I found that there is no difference in render speed or performance between cpu vs gpu. 2 second per frame on cpu ...
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177 views

My blender is so laggy that its unusable, any suggestions

So, two days ago I shut down my computer for a few hours. When I turned it back on and opened Blender, it was extremely slow and still is. (I've tested Unreal Engine and it runs smoothly). All the ...
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2k views

How can I make Blender put less strain on my CPU?

I am using GPU rendering and my CPU is really bottlenecking blender down to only 50% of max GPU performance, while blender is taking up more than 90% of my CPU usage. How can I put less strain on my ...
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558 views

Blender file taking over an hour to load, is this normal?

System spec: Threadripper 12 core, SSD, 32GB RAM, 2080ti File details: 40MB .blend 10 million verts in a curve. File creation details: Curve created via importing of a very large and complex SVG ...
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Blender for competition? [closed]

I am in a competition. I am literally 2 weeks into game dev, and rarely use Blender. I normally just use it for a brief tutorial, and if it works, it works, if not, I just forget about. So the ...
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587 views

What does tile size actually affect?

Besides the obvious you see is the blocks you see when rendering, I see it changes the size of the samples and from tips and testing it can affect render times, typically higher size (eg 256x256 ) on ...
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2k views

AMD RX 570 GPU slower rendering than NVidia GTX 1050 Ti?

I recently built a new PC running on a Ryzen 7 2700X CPU and AMD Radeon RX 570 GPU. However, I'm getting significantly longer Cycles rendering times than my old Intel i5 PC running on an older NVidia ...
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64 views

Cycles: Build without SSE and AVX

I am trying to benchmark Cycles performance without SSE, with SSE only, and with AVX instructions. I am finding weird behavior where if I switch off the "WITH_CPU_SSE" flag in CMakeLists.txt, the ...
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49 views

Texture Painting stuttering

i am having an issue where whilst I am painting (on a new layer, effecting Alpha) the stroke is very 'bumpy', and stutters. I have attached a video to demonstrate. I'm in Look Dev in the video, and ...
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1answer
598 views

Sculpting Performance Workflow

I'm new to Blender and using it to sculpt a character. I have been using Dyntopo for the majority of the mesh up to the point where i got to maybe 1 mio vertices, where I have started to subdivide the ...
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2answers
169 views

Render times changing over course of render

I started rendering an animation in cycles in the late after noon than went to bed with it rendering rendering at around 25 sec per frame (when tested at what should of been the most labor intensive ...
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2answers
1k views

Very bad performance on Cycles OpenCL using Ubuntu 18.04 and Radeon VII

We've got a new render machine for our Company. Threadripper 1950x + dual Radeon VII + 64 gb of ddr4-3200 RAM. (Only one Radeon installed now for testing) Our CPU testing went flawless. With great ...
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1answer
42 views

Is a large UV map heavy on performance while playing?

I have a very large UV map for a house of mine. Due to the nature of the shingles being single duplicated objects, I have quite a giant UV map when exporting and importing for Unreal Engine 4. Does ...
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1answer
152 views

Tips on reducing Polycount in Scene

I have a problem. There is a lot of figures I created for an art project in my school. I used UV Spheres as models and smooth shaded them. In the end I had 35 million vertices and as you can see ...
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1answer
600 views

Slow Performance When Changing Object Data [2.8]

I'm not sure if it's the object data actually, but I couldn't think of a better way to phrase it. Whenever I ctrl+z, change materials, open/close the file, make or change collections, etc, it takes ...
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207 views

Is the File too Big or is Blender too Slow?

I am just now getting involved in photogrammetry and as we know the files are quite large. I am importing an .OBJ file from Meshroom and from the import to any other click there is lag. Being new I ...
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1answer
256 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 ...
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68 views

Viewport performance changes when in camera?

I am working on a fairly simple scene (80k verts) that is mostly made up of simple objects with some subsurf. Normally, my viewport performance is just fine. However, when I hit numpad 0 to view the ...
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23 views

Blender VSE slow regarding PC Capabilities [duplicate]

I am quite a newbie at Blender (v2.79b) and I noticed something disturbing while generating videos. I have 8C/16T, all the raw materials are on SSD and I can only see 1 core working on my machine with ...
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1answer
449 views

Animation Nodes slow performance

I've just started playing with the add-on and created some simple tree to generate tiles but the it works very slow. Currently I have weak machine and the procedure may not be super optima but even ...
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1answer
137 views

Can Cycles take more samples at object borders?

Can Cycles be coaxed to cast more rays in pixels containing a large gradient/discontinuity in depth (or high contrast in brightness)? My scene is fairly simple (effectively an image mapped to a ...
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165 views

Is Static / Dynamic BVH still present in recent builds of 2.79?

There still is Static / Dynamic BVH dropdown in official 2.79 build: That dropdown to choose between them isn't present in recent builds of 2.79 or 2.8 anymore. Viewport resolution only seems to be ...
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27 views

I have view port quality issue (Sorry if this has been asked before I couldn't find an answer)

The image shows my problem it has Choppy edges in the viewport. I looked all over google and this forum but could not find a solution. I have an RTX 2080 and i7 8900k. I fixed it once by creating a ...
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1answer
244 views

What's the most lightweight format for textures?

I want to know what's the best image format to use on textures that consumes the least ammount of VRAM during render. I'm trying to render a scene in Blender 2.8 EEVEE but because of the textures, ...
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1answer
529 views

does more processors and cores help performance?

These are my specs -i3 @3.70 Ghz 2 cores 4 logical processors -8 Gb Ram -147 gb C: Drive -1.81 Tb D: drive when I use rendered view in blender the sampling is really slow (like 1 sample per ...
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2answers
378 views

performance issue creating many objects

I am trying to use blender (2.79b) for batch visualization of data on Windows 10. Unfortunately, blender gets very slow after creating a certain amount of objects. I tried to improve things by "...
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1answer
245 views

Critical Problem : Freeze Problem while Modeling in Blender 2.80 Beta [closed]

I'm trying to model something with Blender. But when I switch it to Edit Mode with Tab and, for example, using Ctrl + R to add a new loop, Blender starts responding about 3-4 seconds after my mouse ...
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30 views

Blender Performence Issues

My blender has been lagging very badly lately. I don't know what to do. please help. my laptop performance details Intel Core i5-4200U CPU 2.30 GHz RAM 8.00 GB
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200 views

is it possible to limit texture resolution by distance?

I know in the simplify tab you can set a reduced texture size for all of the scene, but is it possible to reduce the texture size in vram based on distance from the camera? For example I have a 2km ...
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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 ...
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7k views

How do you optimize Blender/mesh for sculpting with multiresolution modifier?

When I sculpt using Multirezolution modifier I use the following tricks: I start with a base model which has 1000-5000 vertices For each subdivision level I try to finish all work which can be done ...
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1answer
58 views

Does scaling a mesh/curve object to 0 remove its render impact?

I'm currently using the latest build of Blender 2.8 as of this post's timestamp, and I noticed I can't keyframe the viewport visibility parameter (see above) in the Outliner like in 2.79. The render ...
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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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1answer
533 views

Does Blender work on IntelHD 4000

I just wanted to know if I need a high graphics card by that I mean like GTX 1000 etc. Because if I want to make a high graphics animation then I would need a high graphics card right?
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558 views

Why would Blender slow down in editmode with only 2886 vertices?

Blender slows down in edit mode with only 2886 vertices. I am not sure what is wrong with the file. Can someone suggest a solution to this? My PC specs are: Processor: Intel(R) corei7 3.50ghz Ram ...
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3answers
3k views

Blender is only using one tile and only on CPU

I have tried to make blender faster by using my Nvidia GeForce GPU in the user preferences window and under the render options in the properties window. But I can see in the task manager that the CPU ...
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1answer
271 views

Linux Ubuntu 18.04 - Sculpting performance (dyntopo) is terrible in comparison to Windows

OS: Ubuntu 18.04 CPU: i5-6600K GPU: GTX 970 RAM: 32 GB Sculpting on objects with more 100k polygons (dyntopo constant detail 50 px) lags blender, especially using Snake Hook brush and dragging ...
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1answer
372 views

Benchmarks for choosing the right CPU

Is there any reliable benchmark resource (website?) for choosing the right CPU for Blender? I found http://blenchmark.com/cpu-benchmarks, but they seem not reliable. For example, according to them, ...
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40k 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 ...
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1answer
1k views

Help me understand why my cycles render is so slow

This is NOT about asking how to speed up cycles renders. I am just confused to why a scene has taken so long to render. Here we go: I have a camera (WOW) looking up into treetops. Pretty simple. ...
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130 views

Blender file size increses drastically after joning duplicated object and performs very slow

When i join (CtrlJ) duplicated (ShiftD) multiple object or mesh then blender performs very slow and file size increases too from 100mb to 1gb. Does anyone have solutions for this issue?

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