Hi, can you show parts of your code? about how you are managing the progression, purchases of upgrades and storing the data?
This lag usually happens when too much expensive tasks are happening at same time in verse. Normally that would be very rare to occur, only happening with absurdly high counts of things. But as seen on your video, looks like you are not doing much on gameplay that would justify it.
My first assumption is it happening due to orphaned tasks spawned in the code that keeps running forever, recursive calls, or long communication paths instead of direct checks… But for these, we would need to understand what you wrote to be able to help