Multiple issues with Mavericks

Hello all,

I know i am not the first one but there are a lot of issues with Mavericks making computing at the moment quite painful.

Picture yourself a cheetah vading through 5 ft of mud - this is what´s happening after installing Mavericks. The Hdd is working constantly and the memory runs out also on a regular basis, Seagate hdd so should be alright some say but it´s not. Memory (went for the sneaky 4GB, but i can´t see why that shouldn´t be alright anyway) got a tip earlier using the memory clean program and it helps a bit but then the whole thing all of a sudden involves labor like shoveling coal to keep the thing going.

Gmail is another one that doesn´t play ball forgets the password, asking for i 3 times every hour.

Any tips in how to make this less exhausting?