There is a memory leak that they are aware of and working to resolve.
streamers most of them have good pc like 32 gb so it wont be a problem for them to play a game with bad optimisation
i have pretty much the same rig like him with same problem
mine only using 3-5 % of the cpu
buddy i have 16 gb ram and i have the same problem so i dont think that makes a big difference
for my ram the game start at using 1.5 gb but it keeps going up at 30 min in game its using 10 gb of my ram and if i dont close the game its just keep eating my ram its same with gpu and btw patch e1.0.4 really didnt fixed anything atleast i didnt notice any changes
i have seen ppl with 16 gb ram with same problem its not about how much ram you have
it dosnt fix the lag i have already tried it i can play on custom battle 250vs250 and i get almost no fps drop but in campaign no matter the size of the army i get fps drop