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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Collection instances are just like prefabs?

I wonder why unity can load for instance 100 000 objects ( prefabs) and handle them inside the viewport quite well, while blender struggles to even move just 10 000. Would it be easier for Eevee if ...
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10 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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21 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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24 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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1answer
37 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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2answers
31 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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1answer
32 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
40 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
114 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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1answer
86 views

EEVEE render not using GPU fully

I am rendering PNG RGBA frames in EEVEE of a camera fly over a historic building modeled in Blender 2.80.74. PC specs: i7 with 20GB, 1Gb SSD and a GTX 1070 & GTX 1050. EEVEE uses only the GTX 1070....
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30 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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49 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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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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46 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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23 views

Blender 2.80 crashing when I try to open it?

I have installed blender 2.79 before but when I try download Blender 2.80, unzip and try to open it it's just closes like crash without say anything or any error. When I tried to uninstall the last ...
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23 views

Grease pencil in Blender 2.8 Eraser freezing

In my last works I encounter troubles with rubber/eraser, it is working like games on low fps. My current project has 168k points and 1,3k strokes, I remember I had bigger paintings, and everything ...
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1answer
45 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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2answers
348 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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55 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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1answer
37 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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21 views

Viewport animation just tanked to 3FPS out of nowhere

I was trying to create an animation and moving some bones around when out of nowhere my formerly 60fps viewport just tanked to 3fps. I'm not doing anything too demanding either, just making a low poly ...
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2answers
74 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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71 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
60 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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1answer
32 views

Is there a way to limit the number of CPU Cores used for physics baking?

Is there a way (in Blender) to limit the number of CPU Cores used for physics baking, like you can with rendering?
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1answer
26 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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98 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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20 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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55 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
28 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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2answers
523 views

Slow sculpting on high density meshes

iv'e seen people sculpt meshes around 5 mil verts with no lag whatsoever, but everytime i come close to like 1m and above the lag starts to be noticeable and soon any sculpting becomes unusable. Im ...
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1answer
38 views

Blender renders always frame 1 on 2nd computer

I'm using a second computer to CPU cycle render an animation on Windows 10. I have the "common" setup to use the same project file (network drive mapped) on both computers with the same output ...
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278 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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59 views

Blender Won't Open Back Up After Crash

After Blender crashes I wont be able to open it back up again unless I do a restart on my computer. Instead this message will pop up. I am using a Windows 10 Lenovo Laptop, 16 gigs of ram, i7 7700 ...
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1answer
100 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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1answer
483 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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57 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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49 views

Blender does not start

Installed Blender on a machine with Core i7 CPU, 16GBs of RAM and an NVIDIA GeForce 650. I managed to run Blender twice. On the third time nothing was shown and Blender didn't load properly, even ...
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1answer
267 views

Is there a way to make Cycles render slower to use less GPU resources

Is there a way to make rendering in Cycles use less GPU resources? Like some console parameters for rendering engine or settings within Blender? I tried render scene with the console (no UI), ...
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1answer
225 views

Leverage multiple CPU cores for video rendering (VSE)

I have a 1950X Threadripper with 16 cores and even if I set the thread count to 16 manually in the performance section, it still only uses 1 core. Have Cycles renderer selected and both user ...
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2answers
258 views

Rendering using both GPU and CPU is not possible

For some reason I'm unable to render on CPU+GPU. I've checked on 2 different computers and it's not available. One setup is Threadripper + GTX 1070, and the other one Intel i9 + GTX 1080. Is it a ...
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1answer
192 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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614 views

Blender 2.79 Cycles OpenCL RX Vega GPU extremely slow. (Ubuntu 18.04)

I am running Ubuntu 18.04 on a fairly powerful PC (Ryzen 2700x and Vega64) I finally managed to get OpenCL to work at all with ROCm-rehl drivers. When I render the default cube scene CPU rendering ...
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26 views

Blender General Best Practices (to affect a game's performance as little as possible)

I've started modeling a few weeks ago by doing some anvils/random objects/humanoids and animations. It seems that for some of them I used too many unnecessary vertices (and perhaps modifiers) after ...
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382 views

Blender does not seem to utilize CPUs and GPUs effectively for rendering

I've just built myself a new machine because rendering times on my laptop were prohibitive. It's an i7900 10 core processor, 32GB RAM and two Quadro P4 graphics cards with 8GB memory each. The cards ...
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137 views

LOD in particle systems

I've already checked this two questions but neither solve this problem: Level of Detail of Particles System? How to access data related to individual particles? Both posts derive to use animation ...
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1answer
50 views

blender running so slow i can take a nap when clicking a menu

I have a big problem. It's been happening for a long time and it's really urgent as this is payed work. For some reason my project is running so slow I can't even click on the menus. I literally ...
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21 views

Why is my gaming desktop relatively slow at complex animation playback? [duplicate]

I’ve been working on an animation. Due to the large quantity of animated objects (plus a keyframed cloth simulaion), I noticed that when I played through the animation, it went slow. Really slow - ...
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97 views

Struggling with making an audience/public for an gladiator arena

I am a blender newbie, slowly catching up with the program and geting into 3D modeling. I've managed to create a huge arena model, and I have a lot of audience seats that should eventually be filled ...
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99 views

Animation preview is in only 4 fps

So when i start my animation, it is always capped at 3/4 fps, making it impossible to work with. I tried simplify option(in scene tab), but that doesnt seem to do anything