On the same solution, 2020.2 uses about 500MB memory while the EAP (4 or 5) uses more than 1.7GB memroy.
Reason saying "more than" is because it had never successfuly loaded the soltuion. Always ends by crashing with OutOfMemory exception.
The solution is combined by .net framework, .net core and Typescript projects. But it's not consider to be a large solution, each project is small.