The Save File Repair Tool is designed to address specific issues that might be causing your game to perform poorly or crash. However, it is intended for occasional use, not as a regular performance boost. It's a one-time fix for stubborn problems and should be used with caution.
Always make sure to back up your game data before using it, and remember that it's not a guaranteed fix for every issue.
If you are considering using more than once on a save, it might be time to look into other solutions or contact support for further assistance at support@systemera.net

The Save File Repair Tool is a set of experimental settings that can remove excessive objects from your game world, which might help players overcome issues with saves that are crashing or suffering from poor performance related to excessive items. It's designed to clean up specific items that may cause issues, such as certain world objects, inactive Limited-Time Event items, and completed mission objects. 
You can find the Save File Repair settings at the bottom of the General Settings page in the game's menu. Before you use it, a confirmation pop-up with a warning message will remind you that these are experimental settings. 
When you use the Save File Repair settings, the game will create a copy of your save file  and apply the settings to it, leaving your original save file untouched. This copy will be saved with "_ExperimentalModified" appended to the original file name. You will always retain your original save, so you can always go back if needed. 
The Save File Repair settings are designed for one-time use and can only be accessed from the main menu. This means that every time you start the game or load a save, you'll need to re-enable the Save File Repair settings if you want to use them again. 
The Save File Repair Tool offers several options to repair your save file.

• Delete Non-Persistent World Objects: This setting will prevent certain spawned objects, such as small debris from loading, and regenerate them using modified spawn rates.
  
• Delete Inactive LTE World Objects: If a Limited-Time Event has ended, this setting stops related objects from loading.   This setting only applies to event items that were automatically spawned in, not event items the player crafts or receives as a reward. 
  
• Delete Completed Mission World Objects: If you've completed a mission and its related objects are no longer needed, this setting prevents them from loading to streamline your game world.  For example, this setting would remove Frozen Argon, Artifacts, Obelisks, and Mysterious Mushrooms after completing the Rails Missions, even if you’ve previously interacted with them. 

The Roadtrip Update brings new missions, schematics, and improvements to Astroneer. We've also made important adjustments and fixes to ensure a smoother and more enjoyable experience. Dive in, embark on new quests, and see what secrets the cosmos has in store for you!
Alert: New Structures Detected!

• Missions have been added to guide curious Astroneers to new discoveries.
  
• Recruits must complete the following missions in preparation for this new endeavor:
  - G. desolo: Verification

Upon collecting requested Data Circuits, two new schematics will be unlocked

• Extra Large Resource Canister
  - Recipe: 1 Diamond, 1 EXO Chip, 2 Nanocarbon Alloy
  - Printer: Large
  
• Large Rover Seat B
  - Recipe: 2 Plastic, 1 Compound
  - Printer: Medium

• Adjustments have been made to the Tapper. Most organic production rates have been slowed. This should leave a bit more breathing room for other power production methods in the early-to-mid game
  
• Tooltip updates for certain items
  
• Experimental: Save File Repair Settings
  - These settings can be used when saved files cannot be loaded.
  - WARNING: These settings will DELETE certain items from the save in an attempt to make them able to load
  - More about these settings can be found here[blog.astroneer.space].

The following bugs have been fixed as of version 1.31.76.0

• AS-18105: In multiplayer during Rail Missions the host's performance degrades when a client joins when certain Rail Missions are active
  
• AS-19640: Clients in a Multiplayer session do not receive the PUM-KN Shelter from the Fall LTE
  
• AS-19502: Backpack Aux Slot does not autopull next bundle of Power Extenders when auto-connecting the the last extender in a bundle
  
• AS-19639: The PUM-KN shelter hologram in the catalog is missing mouse collision
  
• AS-19998: The full screen Message of the Day image is poor quality and squished
  
• AS-20202: The Breakdown Event item tooltips still list printers and say they can be sent via Exo Request Platform Recovery Rocket after the event is over
  
• AS-20204: The EXO Recovery Platform does not drop packaged Resource Canisters on launch and consumes/loses them
  
• AS-20210: The Exo Request Platform’s progress bar in Control Panel does not match expected values during Repeating Stage in the Summer Event
  
• AS-20511: Several items when drilled into non-terrain will not properly slot into the backpack when quick stowed