Why does a patchy update, ie 1.14.6.0, claiming to improve the performance, ruin the FPS?

I’m confused. In the SU3 thread, you were critical of it and even posted this:

“sarpouli” on Mar 10
[Discussion: Sim Update 3 (1.14.5.0)]
“My stuttering broke a record lately with this sim update III, it lasted one and a half minute at a jaw-dropping 5 fps in exact terms. Interestingly, I never ever had any CTDs with my crawling sim since day one and still none.”

But now you say that you were happy with SU3.