Minecraft mem goes by fast

I put A lot of mods on my singleplayer map and have 16g of ram and use 10g of that ram to Minecraft and I will join my world and push f3 and wait while doing stuff in that map about 5 min and it says 100% where f3 has memory used pls help.

pic it was not fully 100% in this pic but it does get to that point but here is the pic https://imgur.com/a/YSX4sOr