Since Vista Business (Pro) (Windows) 64-bit 15years ago, 64-bit systems (All Windows, and as far as I know, Mac) take a basic 4 GB (+-) to run.
The address space for a 32-bit workstation only allowed 3 GB (+-) and 64-bit allows a much larger address space for bigger applications. 4 GB has always worked decently (for me) since that time.
Memory is inexpensive, so just outfit your machine with 8 GB of memory (or more) and that will definitely alleviate your issue.
Since much runs in the basic 4 GB space, there does not seem to a basic drive to reduce the memory requirement.