At specific point my game starts to freeze every 2 seconds for a second. I can reproduce this with building legendary freezing warehouse.
My save file:
https://limewire.com/d/gas3D#DcI6UezBwJ

If you go to nauvis, there are freezing warehouses ghosts that are normal quality, if you build legendary ones instead of them then the game starts to stutter.

Yeah, experiencing this myself. Tracking the debugging it seems there is a LUA Script lag spike from this mod every two seconds.
My guess is the script has to iterate through literally every stack in every freezer to reset the spoilage.

I wonder if there is a more efficient way of managing this feature.

Thank you for the report, and our apologies for the disruption. This stuttering was caused by the mod processing all stored items in every freezer at the same moment, which briefly stalled the game on larger bases. It has been corrected in a recent update, with the preservation work now spread evenly over time. Please update to the latest version of the mod, and let us know if the problem persists afterwards.
Handled by the mod's automated maintenance, reviewed by LightningMaster.