If s&box runs far worse than other modern games on the same machine, don’t start by assuming you’re “doing it wrong”. First isolate where the performance is being lost: menu, a specific game, or a specific effect.
Step 1: Separate menu FPS from in-game FPS
Community reports suggest the main menu can be heavier than expected on some systems. Test by getting into a game/session as quickly as possible and comparing FPS there.
If in-game FPS is much higher than menu FPS, your problem is likely not “your PC can’t run s&box” but “this surface is currently expensive.”
Step 2: Watch for VRAM pressure symptoms
A common pattern on older GPUs is:
- VRAM fills up
- The system starts spilling into shared memory
- FPS collapses and stays unstable
If you have 4–8GB VRAM, test a few different games/modes and note which ones blow up your frame time.
Step 3: Reproduce one drop on demand
Pick one repeatable trigger:
- A specific weapon/effect (particle-heavy)
- A crowded scene
- A known map
If you can reproduce a drop, you can fix or work around it.
Step 4: Use an “emergency low” preset to test bottlenecks
This is not a recommendation for final settings—just a way to confirm whether your bottleneck is GPU-side effects/shadows.
In the discussion thread below, one user suggested toggling a few console variables:
r_shadows "0"r_postprocess "false"r_3d_skybox "0"r_enable_volume_fog "0"r_enable_cubemap_fog "0"
If these settings barely change FPS, your bottleneck likely isn’t those features.
Step 5: Capture a short “bug report bundle”
When asking for help, include:
- CPU/GPU/RAM and VRAM amount
- Resolution + fullscreen mode
- The exact game/mode/map
- A 10–20 second clip of the drop (if possible)
That turns “my FPS is bad” into something people can actually respond to.
Source thread
This article is based on the discussion in: https://sbox.game/f/general/1782/1/