What's the best ROM to speed up an ailing Galaxy Tab 2??

I bought my dad a Galaxy Tab 2 a few years ago and although he barely uses it, it seems to have slowed to a crawl even whilst using it's most basic functions! (I've tried a full factory reset and it's still ridiculously slow - 20+ seconds just to load up the Play Store for example!)

Is there a generally regarded "fastest" (lightweight?) custom ROM out there that I could put on for him to extend the usability a bit?

Thanks...

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