Heavier, yes. Will the average user notice, no.
It is, by about 50%.
That said, no version of BBpress is particularly heavy on the processor 
Yes, 1.0 has a dramatically higher load.
I’m running 9 0.9.x bbPress installs along with a WordPress install on a single machine that’s doing around 10mm pageviews a month. If I was using the 1.0 branch, I don’t think I could come close to that.
I’ve tried both 0.9.06 and 1.02 and didn’t notice much of a difference. I stuck with 0.9.0.6 simply because there are more plugins available.
Hey citizenkeith… do you have bbPress benchmark installed?
https://bbpress.org/plugins/topic/bb-benchmark/
I’d be interested in the number of queries/output time for your installs… I’ve seen a 10x speed difference in test installs and am wondering how common that is!
John: Here are two active forums, one running 0.9.0.6 and one running 1.02. That latter is integrated with WP. Each install is on a different shared web host.
Running 0.9.0.6 on Hurricane Electric “Starter Virtual Host”
0.075 – 12 queries
0.518 – 16 queries
0.406 – 16 queries
0.334 – 15 queries
Running 1.02 on Media Temple Grid Service
0.580 – 21 queries
0.447 – 18 queries
0.376 – 16 queries
0.728 – 19 queries
