I am using a MacBook Pro with macOS Sierra 10.12.1 I have to say my backup using Time Machine is extremely slow. I am using an external SSD as backup device. Doing some simple benchmarks writing to this disk could be much faster than Time Machine is doing it. I followed a lot of hints here in this forum and others but not really with success.
More or less by chance I figured out that Time Machine is generating a lot of log entries.
$ sudo log show --style syslog --info | grep 2016-11-26 | grep backup | wc 402026 4892227 71866594
I am not wondering now that it is so slow. It generates for each file a log entry and generating almost 70 MB of data.
And below that's one line of almost 400000 identical lines:
2016-11-26 16:32:54.557384+0100 localhost com.apple.prefs.backup.remoteservice: (com.apple.prefs.backup.remoteservice) Created Activity ID: 0x8000000000013d1e, Description: Loading Preferences From User CFPrefsD For Search List
It doesn't sound like a misbehaviour.
But is there a way to switch off this intensive logging ?
I assume TS would be much faster.