Of late, I have been running into a massive slowdown on my two El Capitan Macs- one using the latest beta (mid-2012 MBP with 2.5 Ghz i7 and 8 gigs RAM, platter hard drive, along with a 2011 MBA i5, 4 gigs RAM and SSD.) I've noticed OS X now is stuffing all it can into memory and then working it out as needed. I can't find anything that accounts for this horrendous slowdown. I am comparing it to where they both were performance-wise within the last couple of months. I can switch browsers from Chrome to Safari and it doesn't matter. Any suggestions at all as to what to look at? I've tried but not succeeded in using my own ideas on this.