It seems that if you disable IntelliSense, memory consumption will decrease significantly and the software will become much more responsive. To disable it, go to Tools → Options → Text Editor → Transact-SQL → IntelliSense and uncheck the box. Save your work and run SSMS.
The main disadvantage is that you lose both IntelliSense and Code Outlining. Pretty bummer, but at least you can leave SSMS open for a few days without any problems.
Hope this helps. Greetings.
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