The Early Access release notes for B1644 also mentioned that 1644 would be the start of a longer drive for memory usage improvement, and the B1643 release notes mentioned better performance partly through moving to .NET 10.
The EA release notes should keep you reasonably appraised.
By the way, I linked this thread to an EA feedback thread regarding memory usage: EarlyAccess: Roon 2.65 Build 1645 : RAM usage feedback
It’s best to post EA info/feedback/issues in Early Access to ensure that Roon Labs learns from it.