FPS on Rainbow Six Siege

So my computer is capable of getting 180fps on rainbow six but it rarely happens and when its not I get like 40-60 and it is hard to play because it doesnt even feel like that much fps and I have tried EVERYTHING to fix it. if anyone knows how to fix this please help me. I tried pretty much everything though.
And when I do get high fps it only lasts for as long as I have the game open, once I close it and open another game then relaunch the same game it goes back to the crappy fps and I can't figure out how to change it back to high fps again. I have been trying to fix this for about 2 weeks now but I can't figure it out please help
 
"what is your system memory." what does usage in task manager indicate for the game - does it increase significantly as you play?

display - what resolution?

cpu?
 
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