Dell 7559 running poorly

[admin89]

Nevermind what I said. I thought your CPU was i7 6700HQ . After checking some info about your CPU
2.8GHz is as high as you can go

Quote:The Intel Core i5-6300HQ is a quad-core processor based on the Skylake architecture, that has been launched in September 2015. In addition to four CPU cores (no Hyper-Threading support) clocked at 2.3 - 3.2 GHz (4 cores: max. 2.8 GHz, 2 cores: max. 3.0 GHz

Though it could be a little bit faster (3.0GHz)
http://www.notebookcheck.net/Intel-Core-i5-6300HQ-Notebook-Processor.149424.0.html