Resource statistics now shows number of saved requests. That's funny for promotion, but says nothing. It would be nice to see % of total executed requests.
Guess it wouldn't hurt, we already display the MySQL % in the footer copyright - we could easily add that as a 2nd resource statistic, on most typical pages the mysql saving is between 10-50% (without guest caching) and around 95% with guest caching. Those numbers do dwindle dramatically however if you have mods which are adding a lot.
Keep in mind most clients review mysql throughput/traffic before/after installation for precision tracking of impact
I've purchased vBO "just for fun", and may be, to cache WOL. I'd like to verify some vb issues, and vBO price is verly low, compared to payment to my 3 programmers My site is on single server, with socket connection to mysql. So, traffic is not the matter. Also, nginx & FCGI - no supid races for memory.
On report, when you draw "bubbles" (on mouseover), you could add total requests with %. That will be enougth. 2 lines on graph can cause problems with scale. Bubbles will not.
Right now, turning vBO on/off doesn't make noticeable changes with "top" utility at my site.
It's on my list of things to do in v3 As for the "top" utility, if there's no difference that suggests your site is under very little load to begin with (which is no surprise running nginx/fcgi), depends how many roaming users you have online
Top flows between 3.5-4.5, and 1.5%wa. That's with 4 cores and 1000 online. Wished to compare, if WOL and other caching make sense. Seems, that most problems goes from SQL requests, generated from tachy users on long threads.