[SPZ2-6133] [1.0.0-rc2] simply waving a possible blueprint around over a lot of painters causes lag

[spice fossil]

While a blueprint is in the clipboard waiting to be pasted, it causes the paint shape predictions to update repeatedly in places you wave it over, even though it shouldn't be affecting them yet. When you cancel the pasting, the game remains very laggy until the paint predictions are recalculated.

In the video, I had ~25 FPS until I opened the clipboard and started waving the blueprint around, at which point it dropped to 2-5 FPS. After I cleared the blueprint, the FPS stayed low for several more seconds, until the fluid prediction for things I had not touched finished again.

[urban sorrel]

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 16 reports awaiting team review. Due to the high volume, it may take a little longer for us to get to yours.
⏰ Our team is off on weekends, so it may take a bit longer for us to review your report. Thank you for your patience!

📋 Log files help us investigate issues. You can find yours here:
• Windows: %USERPROFILE%\AppData\LocalLow\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:
• Windows: %USERPROFILE%/AppData/LocalLow/tobspr Games/shapez 2/

1. [SPZ2-5192] — ✨ 88% similar

Holding blueprints severely affects performance
Done • Priority: Critical • Fix: 1.0 Release [1.0.0] • Resolution: Won't Fix

When holding large Blueprints in Classic Mode, the game experiences severe performance drops with decreased frame rate and increased frame time. This occurs even on high-end systems when holding Blueprints containing either 1000 1x1 Space Platforms or 20 Space Platforms with 588 Half Cutters each. The performance impact is considered disproportionately severe for the number of Structures involved. The issue was closed as Won't Fix, with acknowledgment that large-scale Blueprint placement is n...

2. [SPZ2-5474] — ✨ 85% similar

Blueprint with painter tanks FPS when moving
Done • Priority: Critical • Fix: 1.0 Release [1.0.0] • Resolution: Not A Bug

When dragging a blueprint containing painters (close to 350 structures), the FPS drops to around 10. This occurs on minimum graphics settings and above in any game mode and scenario. The issue can be reproduced by starting a new game, enabling cheats, pasting a large blueprint with painters, and moving the camera around. The expected result is that FPS should not drop so severely when moving blueprints. This was determined to not be a bug but a performance optimization task.

3. [SPZ2-5517] — ✨ 82% similar

Improve Blueprint Placement Performance
Done • Priority: Critical • Fix: 1.0 Release [1.0.0]

Dragging a large blueprint (close to 350 machines) causes FPS to drop to around 10, especially when fluid machines are involved. This occurs on minimum graphics settings and above in any game mode and scenario. The root cause is that during blueprint placement, the game simultaneously computes shape previews, checks placement rules, renders the blueprint, and updates the placement map layout, with the placement logic being slow and generating excessive garbage. The proposed fix involves refac...

4. [SPZ2-2838] — 👀 72% similar

noticeable hang when placing island blueprints after a platform with painters
Done • Priority: Highest • Fix: 4 - Early Access • Resolution: Done

Placing Space Platform blueprints after a platform containing Painters causes a noticeable hang or lag during placement. The issue occurs specifically when dragging Pin Pusher blueprints from the Output of a Painter-containing platform. Replacing Painters with other machines like Cutters or Conveyor Belts eliminates the lag. Placing a Space Belt between the Painter platform and the new platform also prevents the hang. Deleting structures in this scenario causes even worse performance issues.

5. [SPZ2-3206] — 👀 65% similar

Predictions still produce lag spikes
Done • Priority: High • Fix: 4 - Early Access • Game: 0.0.0-alpha23.1 • Resolution: Done

Shape Previews still cause significant performance issues and lag spikes when dragging items around in the game. The problem is triggered by having very long Space Belts (around 4000 tiles) in the Savegame, which generates excessive garbage collection taking 60ms even without deep profiling. When the Space Platform with the long belt is in view, the game becomes unplayable due to the preview calculation overhead. The lag is severe enough to make normal gameplay impossible when these condition...

6. [SPZ2-3160] — 👀 60% 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.

Found 6 similar reports • Searched 3,404 reports • Use /check-duplicates to recheck

[sour bridge]

Can you supply the save file from the video with the camera in that position for testing?

[spice fossil]

Original camera position from the video is from two platforms to the left of where this loads. This loads on a platform that shows the problem even better, though: It's a giant stack of mixers and pipes. Copy a medium-large chunk of the painters to clipboard or load a mixer-heavy blueprint, wave it around, exit place-the-blueprint mode, watch the shape predictions lag your game badly as they recalculate all the things you didn't touch.

[urban sorrel]

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

[urban sorrel]

💾 Insane 1.0 beta

Started in

1.0.0-beta7

Last played in

1.0.0-rc2

Scenario

Classic - Insane

Seed

37189

Research

72%

Buildings

1,432,199

Completed

No

[sour bridge]

Thank you 🙂 (Anth: You put it in the flash drive)

[sour bridge]

Have you noticed that it doesn't always do that?

[urban sorrel]

🎫 Many thanks for reporting this issue! We have created an internal ticket for further investigation and will keep you updated. The internal ticket ID is SPZ2-6133 for reference. If you want to provide further information, just comment on this thread.

[SPZ2-6133] [1.0.0-rc2] simply waving a possible blueprint around over a lot of painters causes lag

[spice fossil]

It's pretty consistent for me, as long as I have shape previews on?

The game always lags badly when a non-trivial blueprint is in placement mode, but if you've been placement-moding over a complicated area in particular it lag very badly for seconds even after you clear the blueprint, fluids much more so than shapes, and the little fluid icons moving across the map are why I was assuming it was the previews .

I don't suppose it's possible to pause previewing when there's a blueprint in placement mode, and only resume after it's placed?