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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33 views

Blender crashed computer while baking cloth animation

So I'm following this Tutorial: https://www.youtube.com/watch?v=gFOJ7ul19AE&ab_channel=Ducky3D I'm following exactly as the video, the only difference is that I'm using an Skull instead of the ...
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0answers
208 views

Heavy Boolean Operations

I was wondering why boolean operations are hard to compute for pc, ı got one desktop and one laptop , and uses 2 different operating system , but in all systems stiuation is the same. I am using ...
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1answer
417 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
31 views

Do invisible polygons influence rendering time using Cycles renderer? [duplicate]

TL;DR The number of polygons has negligible impact on rendering time. I'm having a furniture designed part by part using FreeCAD and exported as Wavefront OBJ (following Tutorial Render with Blender). ...
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2answers
371 views

New install of Blender; extremely slow when panning a video

I have read a lot of posts here and on other forums about Blender being painfully slow, to the extent it closes in on being unusable. Here is my scenario: I have a 11 second 4K video (30 MB file) ...
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11 views

Object turning flat grey in rendered view [duplicate]

hello guys. I'm having problem using render mode on blender on any file I've. The models are not displayed correctly on render mode, not on this file,the problem persist on any file. Cycles or Evee ...
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0answers
100 views

2.91 viewport lag after certain amount of time

When I open Blender it runs perfectly smooth, but after a while it begins to lag. I close and open the same file and it runs smoothly again, until about fifteen or twenty minutes pass and it starts ...
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5answers
29k 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 ...
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1answer
220 views

Adaptative sampling on Cycles

I have a scene I want to render where a small object moves across the camera's field of view. The rest of the scene is just a black void containing absolutely nothing (see image below). I need to ...
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0answers
160 views

Blender very slow/unresponsive

I tried to search similar topics to no avail. I am a fairly new user to blender. I have been using and learning the program for 4 months now. Blender has been horribly slow to the point that i can get ...
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2answers
328 views

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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0answers
33 views

Blender performance not improving when disabling viewport physics but does when deleting it

I'm having a very simple problem. I'm using dynamic paint to create ripples on a plane mesh. Something perplexing is happening; when I disable the Dynamic Paint viewport icon (so that it will only ...
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0answers
32 views

Shrink-wrap modifier causing heavy lag to the parent mesh

Following a tutorial for Blender 2.79. Yes, I know. I'm trying to model a Dodge Challenger, and I used a shrink-wrap modifier to more or less "attach" them to the parent, or target mesh (...
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1answer
53 views

Super Laggy when moving vertices, in edit mode, where it shouldn't be laggy

I'm a new modeler here, and its been pretty smooth, until now. I have been working a Dodge Challenger for the past couple of weeks, with almost no speed bumps or anything. With subsurf, The total ...
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0answers
34 views

Blender performing very poorly

I'm trying to follow the tutorials, but the program is freezing up and lagging very often and very severely to the point that I can't do some of the steps of the tutorials such as sculpting because I ...
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0answers
27 views

How do I get viewport FPS higher when using image sequence as plane?

When using a high-res (4k) image sequence plane in Blender, the eevee viewport FPS tanks down to an almost unusable rate, despite there being just one plane in the project and my hardware being ...
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0answers
175 views

Will Intel I7 4770K bottleneck RTX 3080 when using Blender?

I know that in some cases (for example some games) CPU can be a bottleneck for GPU. I'd like to buy RTX 3080 but I wonder if I'll be able to use It's full potential in blender on my current PC. My ...
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0answers
27 views

playing with View Layers - are they always all rendered?

I'm playing with View Layers since I have to separate a lot of stuff from a scene. It's working great but I was wondering how it does impact the render performances. If I have, let's say, 10 View ...
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1answer
28 views

How to get image in real-time? [closed]

It doesn't matter if it works like a capture or if the quality is very low. There's no reason for shadows or light, too. I hope to get only materials' color and shape of model. Just i want real-time. ...
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1answer
471 views

How to prevent Blender from crashing when running out of memory?

I'm waiting for like 5 minutes for a render to start, nothing happens (Blender 2.90.1) and Blender is crashing in the end. I already tried to render the project using Blender 2.83.8 but I'm getting ...
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0answers
9 views

Same file, slower FPS baked data playbak in weaker computers

When playing back a fluids simulation on the 3d viewport (just the simulation. No mesh, no lightning. Just the baked data): I get low FPS on my beefy PC, while I get better FPS count on other machines ...
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1answer
29 views

Are there downsides to increasing viewport samples?

By default the viewport samples are 32 (at least on my machine). This gives me a rough render fairly quickly when the viewport isn't changed. But are there downsides to increasing this number? ...
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0answers
29 views

WilI always more cores and threads translate to better performance in blender? [duplicate]

After writing I guess a 3 page essay describing my problem and after about a year of inactivity on stack exchange I remembered to sum up my problem, so please if you need more details tell me in the ...
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1answer
2k 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.
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4answers
14k 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 ...
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0answers
28 views

Videos from my cell phone have slow playback in VSE preview

Usually when I drag a video from Zoom or my Cannon camera, the preview will play back at full speed. However, when I drag in a video from my cell phone, it only gets ~3 FPS. (Interestingly, the video ...
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1answer
204 views

Too much RAM after load scene textures in high resolution [duplicate]

My current project contains many object with 2K and 4K textures. I don't have problem with RAM during render, but only when I open this scene. It take more than 20GB and it take long time to display. ...
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0answers
322 views

Why is my viewport performance (a lot) slower when using solid mode compared to rendered (eevee or cycles)?

When I use solid mode for my viewport Blender suddenly becomes very slow and laggy. I can still move the camera around or change stuff, but only with a lot of delay. When I switch rendered mode the ...
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32 views

How to overcome odd lag in texture painting mode?

My first post here. I have just recently started to use Blender (running the latest version) and was working on some very easy tutorials today. I'm suddenly stuck at the texture painting part since ...
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0answers
30 views

PC freezes while handling Multires high poly scenes before VRAM is fully used

I'm somewhat new to Blender, and lately I've been trying the new Multires for sculpting high detail poly models. From what I had seen online I was under the impression you would be able to reach very ...
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2answers
220 views

Does CUDA matter for Blender performance? [closed]

Does CUDA matter for Blender performance? What about CUDA and Cycles performance? What about CUDA and Eevee performance?
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0answers
862 views

Blender 2.9 instantly crashes when I try to render in Cycles

Blender 2.9 crashes instantly when I try to either render the viewport in cycles or when I try to render the scene in Cycles. My computer: Mac Pro early 2009 OSX 10.13.6 High Sierra 3.33ghz 6-core ...
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0answers
333 views

1 Nvidia 3090 or 2 Nvidia 3080s for a 3d workstation? [closed]

Currently I'm running very large scenes for particle animations / simulations. I'm particularly concerned about the memory management distribution of the 2 3080 gpus approach for these very memory ...
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1answer
267 views

Poor Undo Performance: Blender 2.9

I'm having issues with Undo locking up Blender on the first undo action following some action. This happens whether I remain in one mode, or on one obj. Basically say I rotate a joint and I don't like ...
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0answers
22 views

Edit mode performance problem with using n

I'm not entirely sure what caused this, but I was playing with a point light and the Eevee settings for shadows. Then I did an indirect lighting bake but deleted it afterward. More I can't remember. I ...
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1answer
188 views

I have better than optimal hardware but Blender keeps crashing

I am trying to get started using blender and follow a simple tutorial to get used to creating abstract renders for design work. While running blender even performing the simplest of tasks my computer ...
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0answers
22 views

Driver to Texture Animation Playback Slowdown

My Animation playback speed in OpenGL 3D view (solid mode) dropped from well above 25 fps to 0.3 fps. As it turns out, the reason is a Driver added to a texture used on a huge number of objects. More ...
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0answers
57 views

Script performance issues. Applying modifiers to mesh with shape keys

I didn't write the script, I can read it, but can't do much else. This script is used for applying subdiv to a mesh with shapekeys, while preserving the latter. However it seems to be leaking a lot of ...
29
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1answer
10k 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 ...
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0answers
41 views

Utilize more threads in viewport

I've got a threadripper 3960X, which is great for rendering. However, when I have a large scene and am moving around in the viewport (no animations or anything, just a ridiculous amount of verts) it ...
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0answers
29 views

Slow fps on animation playback, even without modifiers in solid mode

In Blender 2.83, I'm getting extremely slow playback speed on animations. The fps is at solid 60 before any keyframes are added, but as soon as just a single keyframe is added the fps plummits to ...
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0answers
192 views

Blender too slow for my new computer?

I just bought a new computer and I was following the donut lesson of Blender Guru. When I raise up the number of subdivision of the donut (Viewport) to 3, the problem starts. I can not smoothly move ...
3
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1answer
768 views

“Updating Objects Flags” — Best ways to get around long rendering times?

I'm currently trying to render an animation that taking 15 minutes to render one frame. Whilst watching the render, I can see "Updating Object Flags" stage seems to be the main culprit. The ...
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0answers
14 views

Slow execution and options not available RTX nvidia

Blender GIS 2.83. 1) I cannot find the setting for GPU. Mine is nVidia RTX super 7000. 2) This and other settings for cpu and gpu, I cannot find them in Preferences/System. Surprisingly slow: I have a ...
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1answer
66 views

Will applying Decimate Modifiers speed up Blender?

I'm working on my first big paid project and I'm coming across a lot of problems. I'm not sure what Blender can handle, but my project was something like 6 million plus faces. I'd simply click a ...
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0answers
47 views

What costs so much perfomance in my scene?

I have an animated scene with imported CAD models. Already upon importing the first model and applying materials to it, the perfomance started to decrease drastically, despite me 'optimizing' the ...
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1answer
159 views

Debugging Rig performance

I have a complex character rig. Its a Rigify rig base, but with a bunch of other stuff i've added, like a custom face rig. Somewhere in the process of building it all, the performance has gone down. ...
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2answers
979 views

How is real-time rendering different in blender from game engines?

Real-time rendering is the key feature of game engines like Unity and Unreal. Although advanced rendering by Cycles should take a while, I think Eevee should be able to deliver real-time rendering. I ...
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1answer
36 views

Animated text body drops Playback FPS by half

I'm developing my first Add-On, its main purpose is to visualize Scientific Data (BlenderNC), I'm using Blender v2.83 (Mac OS 10.15.5, 16GB RAM, Radeon Pro 555 2 GB). As a feature, I want to animate ...
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0answers
27 views

Blender on a macbook pro 2015 Catalina with Intel Iris pro and external Monitor bad performance

Blender 2.8.2 performance is very bad with an external Monitor - the basic cube stutters when moving. With the internal Monitor it is ok, with blender 2.97 it is ok. So it seems to have something to ...

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