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The seed note for the beta mail update released yesterday mentions build 13B15.

That sounds very much like an OS X build number and my understanding has for a long time been that the B means 10.x.1. This certainly has been the case since Tiger (although not before).

I may however be mistaken in this case because the more complete quote is

Submit a bug report using the online Bug Reporter at http://bugreporter.apple.com/. Please make sure to include “10.9 (13B15)” in the bug title and description.

But that was 10.9 not 10.9.1

So now I'm just confused regarding build number conventions.

Can anyone elaborate on exactly what is build 13B15?
 
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Apple if you are reading this fix the random one second beachballs make it smooth the animations faster to respond and load apps quicker. And get rid of that horrible disk utility glitch where opening the app is like 5 fps for the animation.

Make it fast like the first couple dps. Get your ass in gear!
 
The seed note for the beta mail update released yesterday mentions build 13B15.

That sounds very much like an OS X build number and my understanding has for a long time been that the B means 10.x.1. This certainly has been the case since Tiger (although not before).

I may however be mistaken in this case because the more complete quote is

Submit a bug report using the online Bug Reporter at http://bugreporter.apple.com/. Please make sure to include “10.9 (13B15)” in the bug title and description.

But that was 10.9 not 10.9.1

So now I'm just confused regarding build number conventions.

Can anyone elaborate on exactly what is build 13B15?

Currently commercial release of Mavericks is 13A603.

Yep, Mail has been definitely the worst culprit here - pretty much everything else is flawless so far. My solution was to delete the whole Mail folder inside Library and start accounts from the scratch/re-import older mail folders.

I have no issues to report now - Mail runs fine.

Thats right. Some people are having issues with Gmail as well. The only outstanding issue I have is with my FW drives not sleeping but that is minor to me.
 
I've had some minor quirks on my new 13" rMBP (only User Folder was transferred). Nothing unusual for a new OS, though 10.9.(realistically)2 can't get here soon enough.

Between iOS 7, Windows 8.1 and Mavericks, my tech life has too much ".0" releases in it right now.
 
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