Indexing eating up 50% CPU

I'm working on a Rails project. I'm using the 9.0 beta. After having the application open for a while (few hours) the indexing takes AGES! IntelliJ locks up every time I make a code change. I can see the throbber which indicates that indexing is going on. After 10-30 seconds the IDE un-freezes until I make another code change.

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