Premiere Laptop

Hi

Currently I have a laptop that just barely runs premiere pro, it can edit videos however I have to wait quite a long time for it to show in the preview screen. I also have some lag.

So my first question is, this summer I will probably be getting a new laptop, but I don't have a very large budget so I was wondering, what is the most budget computer, it can be a desktop or laptop, that I can buy that will run premiere pro well enough that everything functions properly and without lag?

and until I get this new computer, is there anything I can do to make my premiere run faster on my current laptop?

Thanks!