Well I wouldnt call bs on you but my results are that with the New JI2 Leak I can reach a speed of ~6mbps Before on the old firmare i was alway ~3mbps. My upload went from ~500 kbps to ~1.5 mbps. My Ping is also down to about 85. The speed test on my sig is outdated and was done through tethering on a stock JFD firmware.
I think that not all these phone are behaving the same just like jac oc kernel on some phones it works on some it just simply doesnt. I was running your rom before and even though it was a lot snappier i wouldnt sacrifice the GPS, Battery Life, And browsing speed I get with the New JI2 Leak. Others are not so lucky with the new firmware, But calling BS is TOO General of a stement because every single hardware is slightly different.
Phone ::T-Mobile G1 (White & Rooted)
Rom :: MLIGN-HeroV1.1r1
Recovery :: Cyanogen's recovery 1.4 image
SPL :: 1.33.2006
Radio :: 188.8.131.52I
SD Card :: 8GB Class 6 64mb linux swap
Phone :: Vibrant - Rooted
Rom :: Completely Stock Rom W/RyanZA's Lag Fix+JAC's OC Kernel
SD Card :: 8GB Transcend Class 6 1GB ext2
Recovery :: ClockWork/RomManager
Quadrant score :: 2580