Low perfomance on good system?!

Guys, can you help me. I have HP ProBook 455 G1 - Windows 10, AMD RADEON HD 7640G + HD 8750 Dual (2GB non-shared) with AMD A8-4500 APU with Radeon(tm) HD Graphics [4x1.9GHz (Turbo to 2.8GHz)], 4GB Ram and I'm playing on low graphics (except View Distance-High) , Max Resolution, Hardware Cursor, Reduce input lag, Windowed mode. When I go Dalaran it's 20fps... 20FPS? How is that possible. Tried lot of methods shown in internet, installed fresh copy of Windows 10 and nothing... the difference is 5-10fps... HELP PLEASE :D
And other-when I minimize the game it stops responding...
PS: sorry for bad english...

Not sure how much more FPS you expect with a ****ty integrated GFX...
HP ProBook 455 G1 is nowhere near good.