After upgrading my live store from PS 1.7.2 to 1.7.8.6, BO individual order pages are loading slow, about 15 seconds. To change order status the same, add tracking number the same. All other pages in BO load normal speed, including list of orders page.
I removed all but the most essential BO modules, it didn’t fix. I disables all non native modules and overrides, it didn’t fix.
I have another test shop with PS 1.7.8.5 installation on the same shared server and its functioning at normal speed.
I want to pay someone to definitively fix this issue.