Hi @stq001,
I apologize for the situation you are experiencing. Version 11.9.0 included updated that made the IDE a bit unstable, causing it to freeze constantly even with higher-end PCs. Version 11.9.1, was just released a couple of weeks ago, and addresses some of these issues allowing it to run a bit better. Please download the latest version of MCUXpresso v11.9.1 here.
BR,
Edwin.