slowdown

I upgraded my old laptop from a HDD to a Crucial BX 500 SSD this year. It is a well known issue with these drives that they slowdown after sometime. Crucial has an article on this and solutions to solve this issue on here...

Here is a more precise phrasing of the question: What would be the average speed decrease of a modern CPU when the speculative execution feature is disabled? Post your opinions backed up by reasons. That is, don't just say "it would be about XX% decrease", you need to explain why are you...