High VRam usage after installing nvidia drivers

I am new to linux and I have dual booted my pc with ubuntu 20.04. After this I installed Nvidia drivers using following commands

ubuntu-drivers-devices

Output

sudo ubuntu-drivers autoinstall

for installing recommended nvidia-driver-510

But now my ram usage has increased abruptly, here is snapshot of htop output

I am totally new to all this, how to resolve this issue?

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