Is there a simple way to request less rows from a MySQL database (through PHP)?
Odds, evens, every n rows but still have the full timerange?

My Home Automation chart has quite a bit of data and when I load the 4 week chart it is very slow. Total data comes out at about 8 MB - 403200 entries (1 per minute, 10 sets).

I may have found an answer.

Looks like my previous search terms were rubbish when looking for a solution.