Help on improving laptops performance on running games like Space Hulk Deathwing and CS:GO as frame rate is really bad.

Jan 6, 2019
Recently got a laptop, Dell Inspiron, am no whizz with them admittedly but after getting steam and a couple of games like Dawn of War and Wargames EE which ran like a charm, my other two games CS:GO and Space Hulk Deathwing run horrifically frame rate wise. Hoping there is a way of improving this without having to fork out a tonne