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

Jan 6, 2019
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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