I am still happily running version 1.01 on my computer until this mess is taken care of. Ive likely booted 50-80 times with out the cache rebuilding. It’s rock solid, no crashes or random cache rebuilding. When I was running the newer versions and got that pop-up (your cache is being rebuilt) I already knew it had happened before seeing the pop-up. Boot time during a cache rebuild seems to be 2+ minutes, about 4 times as long as a cached boot (around 30-40 seconds). Programs also take along time to open. So yes, a very big performance difference after it displays that message. Then just when it got back to speed, it dumps the cache after 2 or 3 boots we start the entire process over again.
The newer versions may have bugs fixed, but the also introduce new bug that were never present in the old builds.