Time Machine extremely slow and writing a lot of log entries 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[1345]: (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.
Information update: 

In the meantime I have macOS version 10.12.2
Now there are only some few ( less than 100 ) lines of syslog entries.

But the situation is unchanged. It took 124 minutes to write 495 Mbyte of data to write. Which is about 68 kbyte/second.