Fastpath and Mangle rules incompatibality

I use mangle rules on the RB5009Upr to let specific devices (by mac address) use different PPPOE connections when Fastpath is off (IP-Settings) everything works well but once I turn Fastpath on speeds Plummet to less then 1Mbps, I do not think this is expected behavior.
Does anyone else encounter similar behavior?

It is expected behaviour, fastpath and mangle are not compatible.

The issue is that throughput is reduced to less then 1Mbps for the connections that go to mangle pre routing mark routing , pre routing mark connection , output mark routing when allow fast path is on.

Yes, that is expected. You need to turn fastpath/fasttrack off to use mangle routing.

Not true. You can have fasttrack work on connections that aren’t mangled. Sindy explains a lot of it here:

http://forum.mikrotik.com/t/fasttrack-causing-slow-https-loads/154849/1

That is true, but the topic starter mentions fastpath and that does not have such capability.
He would have to migrate to fasttrack and then use those directions to make exclusions.
I normally consider it “not worth the effort”… I just buy a more powerful router.

Thank you sindy’s solution works by making it selective, you have to add e.g. connection-mark=no-mark to action=fasttrack-connection rule, to make it ignore packets belonging to any marked connection.

So the topic is actually about fasttrack, not about fastpath..