Upgraded DS-2CD2185FWD-I (G1) to v5.6.6 now web interface REALLY slow.

I have lots of DS-2CD2185FWD-I (G1 firmware) cameras and I upgraded one to the latest firmware 5.6.6 from here

Now the camera web interface is REALLY slow compared to all the other same cameras on 5.6.5, for example:
5.6.5 from login to live-view = 10s
5.6.6 from login to live-view = 20s

5.6.5 from live-view to system config settings = 2s
5.6.6 from live-view to system config settings = 20s to show page then another 5s for serial etc to fill in on that page.

So I didn't upgrade any...

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