#trains cause stuttering and hitching

13 messages · Page 1 of 1 (latest)

leaden dock
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on mac at least, at a certain point i randomly started getting brief freezing and hitching, did not arize gradually, it seemsed to happen after i pasted in a MaM

shy valveBOT
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Thank you for reporting this bug! Our team will review your report soon.
Feel free to add more details in follow-up messages — we're also scanning for duplicate reports automatically now.
📨 There are currently 72 reports awaiting team review. Due to the high volume, it may take a little longer for us to get to yours.

📋 Log files help us investigate issues. You can find yours here:
• macOS: ~/Library/Logs/tobspr Games/shapez 2/Player.log

💾 Savegame files (.spz2) are very helpful if relevant to the issue!
Export via Main Menu → Play → click the download icon on the relevant savegame.
You can also find them here:
• macOS: ~/Library/Application Support/tobspr Games/shapez 2/

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1. [SPZ2-5815] — 👀 72% similar

Train shape predictions cause major performance issues when rails are on-screen if the camera is close enough
Done • Priority: Highest • Fix: 1.0.0 Release • Game: 1.0.0-alpha4-rc1 • Resolution: Fix Verified

Shape Previews on trains cause major performance drops when rails are visible on-screen and the camera is zoomed in close enough. The issue is triggered by viewing or connecting rails while shape previews are enabled, causing stuttering and frame rate loss. Zooming out slightly significantly improves performance. Profiling indicated the issue is related to the ValidateCluster method rather than train navigation predictions. The expected behavior is that rail visibility and placement should no...
💬 Threads: [1.0.0-A4-RC1] Train shape previews pass

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2. [SPZ2-6033] — 👀 68% similar

Game freezes while doing train-related placement actions (and possibly from just holding train related platforms) with predictions on with the supplied save file
Done • Priority: Critical • Fix: 1.0.0 Release • Game: 1.0.0-beta4 • Resolution: Fix Verified

The game freezes indefinitely when performing placement actions related to trains with Shape Previews enabled. Specifically, moving a held Wagon Loader into the same position where a previous Wagon Loader was connected to a Rail and then undone can cause the game to become permanently unresponsive. The freeze may also occur when holding train-related Space Platforms and moving over Rail. No error appears in the log file. This issue does not appear when Shape Previews are turned off, and it ha...
💬 Threads: [1.0.0-beta4] Game freezes randomly

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3. [SPZ2-3160] — 👀 65% similar

Massive performance issues (possibly due to fluid predictions)
Done • Priority: Highest • Fix: 4 - Early Access • Resolution: Done

The game experiences severe performance issues including massive lag, FPS drops, and complete freezing that occurs suddenly during gameplay. The issue appears to be related to fluid Shape Previews on Conveyor Belts. The performance degradation is so severe it makes the game uncomfortable or unplayable. Multiple users have reported this same issue. A temporary workaround exists by switching to simple prediction mode, though this reduces the accuracy of fluid predictions.

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4. [SPZ2-3946] — 👀 60% similar

Simulation causes stuttering on some systems when Simulation Threads >= ProcessorCount
Done • Priority: Medium • Fix: Dimension Update [0.1.0] • Resolution: Done

When Simulation Threads setting is set to a value greater than or equal to the system's logical processor count, shapez 2 experiences noticeable stuttering and freezes lasting 100ms or more. This issue is more apparent on systems with lower core counts that can otherwise maintain smooth framerates. The problem occurs because the Max setting was using a fixed 32 threads regardless of system capabilities. An Auto setting that dynamically sets threads based on the actual processor count resolves...

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5. [SPZ2-3643] — 👀 55% similar

[0.0.9-rc1] Camera jerks, low fps every few seconds
Done • Priority: High • Fix: Version 0.0.9 • Game: 0.0.9-rc1 • Resolution: Cannot Reproduce

After starting a new savegame and enabling cheats, moving the camera around causes periodic freezing or low FPS every few seconds. Disabling "Parallel Rendering" in graphics settings appears to fix the issue. Multiple players have reported similar experiences, though the issue is not consistently reproducible on QA systems. The development team has identified several spike sources including TranslucentImage.Start, HUDIslandSelectionDetails, and HUDInteractionZoomManager, but no clear dependen...

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6. [SPZ2-5924] — 👀 45% similar

Lower spec machines are having consistent stutters for larger save files
Done • Priority: Highest • Fix: 1.0.0 Release • Game: 1.0.0-A3-A5 • Resolution: Fix Verified

Large savegames with high structure counts cause consistent stuttering and momentary pauses on lower-spec systems. This is triggered by a reactive simulation slowdown mechanism that reduces simulation speed to maintain ~30 FPS when the system cannot handle the savegame size. While it achieves a relatively stable average frame rate, the non-adaptive implementation produces highly unstable frame times, resulting in visible regular hitches in gameplay. Higher-spec systems show no stuttering even...
💬 Threads: [1.0.0-A5-RC2] Stutters at high building

Found 6 similar reports • Searched 3,563 reports • Use /check-duplicates to recheck
rotund garden
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Hi @leaden dock

If you are willing to, would we be able to get the save file causing the issue and a player log from inside that save? Also, was the MaM working without performance issues prior, or was there an addition of more trains that caused the performance issues?

Thank you,
Josh

leaden dock
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i think it was the shape preveiws coming from its 80 unloaders, i turned preveiws off and it fixed it

shy valveBOT
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✅ Thank you for providing further information, our team will have a look again!

woeful mirage
leaden dock
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i do