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When I rotate the object, it is having jagged lines. It was smooth before but I am suddenly facing this problem. The first image is the original one, 2nd one after rotating a bit.
View > View using CPU
It seems like you have pixel preview mode on, Everything is shown like rasterized. Perfectly vertical and horizontal lines are still ok, but others are jagged.
Goto the View menu and uncheck Pixel Preview.
Required, but never shown