Lagging playing Overwatch

Hi
i played Overwatch for the first time with my set up. list of set up is listed below with overclocking.
The game was lagging so much, it was very annoying. While i was playing, I checked the task manager, and the memory was running 99%..
My set up should be more than good enough to run Overwatch i think..
What do you guys think?

Something isn't right. Are you getting similar high memory issues when running other games?

What OS are you running?

Have you checked to see if some other process or processes are running at the same time such as you might see with a viral infection?

Is your video card driver up to date?