[SPZ2-5864] [1.0.0-ALPHA5-RC1] Loading saves is very slow compared to 0.1.1

[winged glen]

I loaded a 1.5m building save in 0.1.1 and it took 5 minutes and 15 seconds to load. A 300k building save in A5 takes about 5 minutes, a 800k building save takes 27 minutes, and a 1,481,374 building 1,852 platform save took 3 hours, 6 minutes, 38 seconds and 128 milliseconds.

[silver brook]

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.
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📋 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. [SPZ2-2882] — 🔥 92% similar

Loading time is extremely slow with ~450k buildings
Done • Priority: Highest • Fix: 4 - Early Access • Game: 0.0.0-alpha22.4 • Resolution: Done

Loading time for savefiles with approximately 450,000 structures is extremely slow, taking around 4-5 minutes to complete. The performance issue was suspected to be caused by quadratic scaling in the loading algorithm. This significantly impacts players with large factories, making the game difficult to access. The issue has been verified and fixed, with loading time improved by roughly 40% through linear scaling optimization.

2. [SPZ2-4786] — ✨ 80% similar

Big savefiles have very long loading times and cause the game to freeze if it's minimized while loading
To Do • Priority: Medium • Fix: 1.0 Release [1.0.0] • Game: 0.1.1

Large savegames with over 500,000 structures experience very long loading times in shapez 2. When the game is minimized during loading in borderless mode, it appears to freeze and may show a "stopped working" error message, though it will eventually load if given enough time. The loading widget stops spinning during longer loads, making players think the game has crashed. Testing showed that loading times have increased in newer builds, with borderless mode taking significantly longer when fo...
💬 Threads: [0.1.1][Windows] Freezes when quitting

3. [SPZ2-1735] — 👀 60% similar

Savegame serialization is extremely slow
Done • Priority: Critical • Fix: 1.0 Bugfixes before Feature Freeze • Resolution: Done

Savegame serialization is extremely slow when there are more than 100,000 structures placed in the game. The serialization process takes over 1 second to complete with this many buildings. The issue was tested across multiple game versions including 0.0.9, 0.1.1, and 1.0.0-alpha1, with version 0.0.9 showing the best performance. Testing was requested to gather more data on the exact serialization times with large numbers of buildings to assess the severity of the performance degradation.

4. [SPZ2-5314] — 👀 40% similar

Autosaves impacts gameplay when they happen at higher structure counts
Done • Priority: Medium • Fix: None • Game: 1.0.0-dev • Resolution: Won't Fix

Autosaves cause noticeable gameplay pauses when they occur at higher structure counts. The issue is triggered every 5 minutes during autosave with high structure and space platform counts, demonstrated with a savegame containing 616K structures. Each autosave creates an obvious pause that interrupts smooth gameplay. Players expect to play smoothly even when autosaves occur. The issue was closed as won't fix, with the suggestion to increase autosave interval time.

5. [SPZ2-3839] — 👀 35% similar

Save and following "Quit to Desktop"/"Back to Menue" always shows "Quit without saving"
Done • Priority: Medium • Fix: Dimension Update [0.1.0] • Resolution: Done

After saving a Savegame in shapez 2 with 1.34 million Structures, the user no longer has enough time to quit the game without triggering the "Quit without saving?" dialog. The save process takes between 8.5 and 9.5 seconds, but the timer that checks if the player saved recently was set to only 10 seconds instead of the intended 10 minutes. This affects large Savegames on Linux with Steam Cloud disabled. The issue was fixed by increasing the timer from 10 seconds to 120 seconds (2 minutes), th...
💬 Threads: Save and following "Quit to Desktop"/"Ba

6. [SPZ2-4568] — 👀 30% similar

Optimize Performance of First Time ShapeOperation Execution
To Do • Priority: Low • Fix: 1.0 Release [1.0.0]

When loading the main menu or loading a Savegame, the first execution of ShapeOperation creates megabytes of avoidable garbage over the first minute. This is one of the primary reasons why FPS takes a long time to stabilize after loading. The performance issue affects the initial gameplay experience by causing frame rate instability until the garbage collection settles.

Found 6 similar reports • Searched 3,127 reports • Use /check-duplicates to recheck

[winged glen]

Over 2 hours now.

[winged glen]

Woot! 3.11 hours!

GameSessionOrchestrator:Init_3_1_ExistingSavegame took 11198.128s.

[winged glen]

Alpha3: 1,475,923 buildings 1,838 platforms: 3 minutes 10 seconds

[silver brook]

🎫 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 SPZ2-5864 for reference. If you want to provide further information, just comment on this thread.

[SPZ2-5864] [1.0.0-ALPHA5-RC1] Loading saves is very slow compared to 0.1.1