Hello this problem I think depends on the browser, even with imacros (another automation software) there was and I do not think you can solve, especially Chrome consumes a lot of memory.
It is probably the javascript that consumes all the memory, I have overcome the problem by starting firefox via batch file, runs the macro and closes, after the batch file performs the next macro.
Consider that ui vision often freezes for other reasons so it is risky to let it work for hours since it is easy to block (freeze, kantu not connetct to browser tab, and other similar errors) so I preferred to fix it by setting a periodic closure that i avoided both the consumption of the ram and any random errors of ui vision.
In my opinion there is no other solution you can adopt, if you use ui vision for firefox takes up less memory.