Windows 10: Why is my laptop so slow?

My laptop has a Processor of IntelR CoreTM i5-8250U CPU @ 1.60GHz, 1800 Mhz, 4 Cores, 8 Logical Processors and 8gb of Ram. It has been for years but I have only used it for 3 years. Though from the last year to now, my laptop is running incredibly slow at startup and normal daily runs. The RAM is kept continuously using 45% when I only open 4 tabs on google. I have turned off all the special background features on google as well as all the unnecessary animation in my pc. I have degraded it from window 11 to window 10 but it's still as slow as normal. I have canceled all the application

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HELP! My Laptop has gone into SLOW MOTION!

Should be able to get a "step-by-step here;

http://support.dell.com/?~ck=mn

 

Best laptop under $800??

Well the last one I suggested seems to be the best for 650$

EDIT: to facilitate your search...

Laptop GFX benchmark list

Laptop CPU Benchmark list

 

Constant script errors and slow loading pages in 10 internet explorer 11

I have done the steps listed above. They have not helped and I am still getting constant script errors, along with slow loading pages. Are there any other suggestions?