should I expect increased server load.

upgrading from 3.3 to 3.5.1

Hello ,

There should be no additional load between vBSEO 3.3.x and vBSEO 3.5.1

I saw something threads here about server load problems after upgrading to vBSEO 3.5, i'm still under vB 3.8.x, there are any advantage or it's recommended upgrading to vBSEO 3.5?, if i upgrade to 3.5 can i downgrade back to 3.3.2?.

Thanks

vBSEO 3.5.1 will run fine on vb3.8.x. Most threads you see complainng about load are from people getting 10000+ visitors a day on shred hosting providers for $7 a month.

The 3.3.x series will likely meet end of life after our next major release. If you are running fine now on 3.3.2, you shouldn't have any issues going to 3.5.x.

And yes, you can always downgrade.