I think its related to clouds, have you tried to disable clouds?

Please let us know in note section if you are still able to reproduce this issue in latest Development build.

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Thank you.

I can reproduce this on experimental build 0.44.116358 , too. It seems to be related to the Video Texture Memory settings. Game freezes up to several seconds If it is set to Auto. Changing this to 1024 fixes the problem for me.

This happens almost only in Towns.

My startup options are:

-cpuCount=4 -exThreads=7 -maxVmem=1024 -maxMem=4096 -malloc=tbb4malloc_bi -noFilePatching -noSplash -skipIntro -noLogs

my .profile file is set to read only, if that matters.

don't think it's related to clouds. disabled them happens none the less.
happened to me yesterday even in the middle of the nowhere in a forest. get around 2-4 fps on average, so way more severe than OP stated. it all happens in a wink of an eye: fluid gameplay, all of a sudden unplayable.

can someone verify if this just happend at dusk/dawn or night? (played on experimental with net-msg and accl. time at night)

however: no desynch, bandwidth pretty average.

EDIT: just logged out at night, logged back in, now it's dawn and suddenly it's way better, although some stuttering from time to time but not crippling as before.