Bugs & Issues – Assetto Corsa Competizione (ACC)
This page collects known and suspected bugs when using RaceLab with Assetto Corsa Competizione (ACC) – overlays not appearing, missing data, FPS drops or stutters. It helps you decide whether you are seeing a core ACC issue, a RaceLab issue, or a PC / network / telemetry issue.
Before you call it a “bug”
- Update ACC to the latest version via Steam / Epic.
- Confirm you are on the latest RaceLab version.
- Restart ACC, RaceLab and (if needed) your PC.
- Test in a simple single-player session with default settings.
- Temporarily disable other HUD tools / overlays / telemetry apps. [2]
Common symptom categories in ACC
- No overlays / no data – RaceLab running, but overlays never show.
- Missing or incorrect timing / position compared with the in-game HUD. [3]
- Performance & FPS drops when overlays or streaming are active.
- Network / UDP glitches – data freezing when server is laggy or unstable.
- HUD conflicts – ACC native HUD plus external overlays fighting for space.
What to collect for a report
- ACC version and session type – single-player, CP servers, league server, public lobby, etc.
- Your PC specs (CPU, GPU, RAM), monitor setup (single / triple / VR) and wheel base.
- RaceLab version and which overlay layout was active.
- Network type (wired / Wi-Fi, approximate ping to server) if it feels network related.
- List of other telemetry / HUD tools and streaming / capture software you use.
- Screenshots or a short video clearly showing the overlays and the issue.
Where to report
For core ACC bugs (server issues, physics, official content problems), use the official ACC / Kunos support channels and forums. [1] For problems that only appear when RaceLab is running – overlays, data, timing – use the RaceLab Discord bug-report channels or the RaceLab roadmap / tracker. [4]
Quick triage – is this an AC bug, a RaceLab bug, or something else?
Use this panel as a fast checklist before you post a bug report. It helps you send your issue to the right place and include the details people need to reproduce it.
1. Does Assetto Corsa misbehave without RaceLab?
- Close RaceLab and any external overlays or capture tools.
- Restart AC and join the same car / track / session type.
- If crashes, stutters or HUD problems still happen, treat it as a core AC / content / mod issue. [1]
- If the problem only appears when RaceLab is active, continue below.
2. Is it linked to apps, mods or data?
- Test with an official Kunos car and track, with heavy mod packs disabled. [1]
- Disable other in-game apps (particularly custom timing / HUD apps) and leave only RaceLab.
- If you use CSP or reshade, test with a simpler graphics preset or temporarily disable them. [2]
- If symptoms follow a specific combo of mods + apps, treat it as a mod / app interaction issue instead of a pure RaceLab bug.
3. Could it be performance or capture related?
- Test without streaming / recording to see if stutters disappear.
- Lower graphics settings, AI count and post-processing filters.
- Monitor CPU / GPU usage and VRAM while driving.
- If FPS and smoothness improve when overlays / apps are removed, treat it as a performance / configuration issue rather than a pure RaceLab or AC bug. [2]
Before posting your report
- Write a short, clear title – e.g. “AC – RaceLab overlays freeze when loading into second race”.
- Include your PC specs (CPU, GPU, RAM), monitor setup (single / triple / VR) and wheel base.
- State whether the session was offline, public server, league server or modded server.
- Mention the AC version / build and RaceLab version you are running. [4]
- List the important mods, CSP version and apps that were enabled.
- Attach at least one screenshot or a short clip showing the overlays and the issue.
Sources & References
- Official Assetto Corsa and Kunos community resources on game stability, mods and known issues. ↩ back
- Community guidance on CSP, custom apps and performance tuning for heavily-modded AC installs. ↩ back
- RaceLab documentation and community reports on AC timing / data differences compared to the in-game HUD. ↩ back
- Recent RaceLab and AC patch notes that can temporarily affect app behaviour and data output. ↩ back