I've encountered a few little anomalies of late. This one is troubling, though. I have a song with 3 audio tracks, 4 busses. Mostly UAD plugs, save for 3 Sonitus EQ's. Then there's the Slate FG-X limiter/brickwall on the master. No softsynths. 5 minute song. Fast bounce. Takes 6 minutes. Seems really long, considering I know I've done a 35 track 4 and a half minute song in 6 minutes with a bazillion plugs.

There is an optimization in Kingston that should improve this. Report back if you still have this issue after the upcoming update. Also what are you comparing against - did you try this same project in a prior version at the same buffer settings or do you just think it should go faster? How many hardware outs are in the project?
There are many reasons why a bounce could go slower depending on the plugins in the project.

Be sure you've bounced down any clips that use Melodyne or AudioSnap - this counts even if you just adjusted the timing of an event with the transient filter on and never opened the AudioSnap palette.  If you don't bounce these clips down, Sonar spends more time processing them during export.

There are the same 2 hardware outs as always. I know it should go faster than this. It's 4 tracks and a scant few plugs. As stated in my post, I've done way bigger projects than this faster than this. No guesswork involved.
 
BTW - are the numbers for Kingston only in  W10? I can't get W10 onto my system to save my life. Failed to complete 24 times before I gave up on it.

Well my hopes for Kingston fixing overs at export are dashed. Not sure what to think since FG-X seems to be doing it's job, at least according to it's meters. This was shot during export, not playback. Though the same thing happens in playback... " />

I unchecked fast bounce. Lesser over, but it persists. Running 1024ms." />

What if you put another bus between the Master and Main Outs? if that one looks good, then something else is likely routed to Main Outs in parallel with Master.

Noel Borthwick [Cakewalk]
There is an optimization in Kingston that should improve this.

Much quicker for .wav and .mp3....however with Kingston my performance meter is not showing active core's.
 
rafone

Have you tested this exact project specifically with an earlier build where the bounce was faster?
As mentioned there are a lot of variables so we need a specific project to repro this.