Turn off the power saving mode. You will get the smoothness and speed back.
In normal everyday usage, quad core performs better than these so called under clocked octa core processors. Most everyday apps do not require octa core processors, they mostly rely on single or two cores at max, which is why benchmarks usually measure single core performance separately and sensible brands do not put octa core processors on entry or mid range phones. Two quad cores perform better than one octa core.
The processor with better single core performance gives speedy response in everyday use. Usually quad cores have better single core performance than octa cores in entry to mid range.
Which variant do you got?
