My laptop is 7 years old, don't think it's a hardware issue. Try using a different browser, google chrome and comodo dragon work best for me. Every time you come to play Tynon click settings and 'start incognito window' so that you never have to clear cache/cookies. Comodo dragon is faster for me but chrome handles better during events like the noble lady, baal, etc.

Only other thing I could think of is you having too many programs running at once or virus :/