I've posted a similar thread on the Apple forums, but responses here come in a lot quicker. 
After upgrading to 10.9.2, Time Machine backups to my 802.11ac Time Capsule are *much* slower -- less than 10% of pre-10.9.2 speeds, usually less than 1-2% -- previously 20-30 MB/s (Bytes, not bits), now mostly less than 1 MB/s (tens to hundreds of KB/s) with occasional spikes to ~1.5MB/s.
The machine is a late 2013 15" MBP.
Thoughts?
After upgrading to 10.9.2, Time Machine backups to my 802.11ac Time Capsule are *much* slower -- less than 10% of pre-10.9.2 speeds, usually less than 1-2% -- previously 20-30 MB/s (Bytes, not bits), now mostly less than 1 MB/s (tens to hundreds of KB/s) with occasional spikes to ~1.5MB/s.
The machine is a late 2013 15" MBP.
Thoughts?
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