This bug affects me too.
With 16 GB RAM ltsp-update-image needs 40 minutes and with 8 GB it needs only 3 

Results with 16GB RAM:
real 40m58.672s
user 14m15.420s
sys 0m20.212s

Results with 8GB RAM: 
3:12.53 elapsed
667.48 user
12.29 system

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  Slow disk writes after some uptime, only on certain hw and 4.4+

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