AMD Ryzen 5 4500U is processor manufactured by AMD and launched in Q2 2020 . It's using FP6 socket. It has 6 cores and 6 threads with clock of 2.3 GHz that can turbo clock itself to 4 GHz . This processor is used in Mobile devices and can consume up to 15 watts of power .
NVIDIA GeForce GTX 1660 Ti (Mobile) is graphic card manufactured by NVIDIA and launched in Q2 2019 . It's using PCIe 3.0 x16 bus type. It has core clock of 1455 MHz and 6144 MB (6GB) of memory . It supports DirectX 12 and OpenGL 4.6 . This graphic card is used in Mobile devices and can consume up to 50 watts of power .
This configuration has 9.7% of processor bottleneck .
When playing games your graphic card won't perform on maximum possible performances (won't be utilized to the maximum), because you processor won't process and deliver data fast enough. This theoretically means that utilization of you processor will be on maximum and the potencial of graphic card will not be completely used.
Processor bottleneck is worse, than graphic card bottleneck, because utilization of your processor will be on maximum and it will throttle other programs that are ran in background. Also you won't experience maximal performances that your graphic card offers.
You can resolve this by upgrading your processor or by downgrading your graphic card. Downgrading your graphic card doesn't make much sense and in that case is better to leave current graphic card in you computer.