would be great if you could combine potions because when you have 500 potions sitting there it would be great to have away to use them other than using them when your health goes down every ten, which when you have high lvl armor it doesnt go down very quickly. also it would be nice to have a full heal button that takes you to max health rather than having to click multiple times.
get new computer! I know that's not a real solution, but that's all I can suggest.