Laptops Need help : Laptop dead slow suddenly after connecting monitor

Hi,
I have been using Lenovo Z50 laptop for 6 months now and replaced it with 126gb SSD as soon as I bought it.
Everything was working super fast and smooth.
I have also connected a 24-inch Dell U2412 and have used it for 2-3 months now , fast and smooth.
Today I connected my new Samsung 27-inch S27E510C and it started performing way too slow.
A simple task like deleting a file says "preparing to delete" and never ends.
Opening "my computer" is also slow and I see 'magnifying glass rounding " sign but never opens.

Now I have removed the monitor and using just laptop and it's still the same. Too slow
What do I do? Not sure if connecting the monitor did something or something else happened overnight.
Tried C cleaner , and fixed registry also. Still the same.

What do I do?

Thanks in advance.
 
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