Low Power Mode makes animations lag in iOS 11

I have an iPhone 5S and I've noticed that when Low Battery Mode is ON, unlock animation and notification center are having laggy animations. When I turn OFF Low Power Mode everything seems to be smooth. This has to do with Low Power Mode in iOS 11 because I never had those laggs in iOS 10 even when Low Power Mode is turned on. Apple please fix this in future because I'm not the only one to have this issue.