Yosemite graphics slow and choppy

This is more of a warning to people thinking of upgrading, and a comment directed towards the people working at Apple.

Running a 13 inch late 2013 Retina with 8 gigs of ram, core i5 and SSD.

After having installed Yosemite, i instantaneously noticed several processes (mainly graphical ones) slowed when using the OS X under any circumstances:

1) Generally, browsing around using several finder windows, searchlight, minimizing and maximising windows ect. (In other words daily use) is lagging to a point where it is not only annoying, but also slowing down my work process.

2) Opening (any) applications is slower. Usually I would not have one single "bounce" on opening i.e. Chrome, now i have 3-4.

3) Under computational load, this is completely unbearable. As a scientist, I frequently use MATLAB. Before Yosemite I could easily do multitasking while running a job in the background. After Yosemite, changing desktops, opening and closing finder, ect. is unbearably slow, choppy and unresponsive while running matlab (newest version).

I realise that making software which works is hard and that there may be idiosyncratic effects of each hardware/software/use setup. But everyone at my workplace is experiencing exactly the same phenomena of being able to work fine in Mavericks, and not at all in Yosemite. Several have already downgraded again.

Exactly the combination of far-from flawless upgrades (Mavericks was really good) and the detrimental lack of e.g. customisable load on GPU, is what will keep me from buying a Macbook next time around.