Could you please diagnose my bottleneck?

[TkSilver]

DraStic high res mode is really designed for and on Exophases laptop, He kind of always said it might work on highend devices but probably not always well. Drastic only uses your GPU to display the output from the emulator and to do shaders all the calculations are done in software.

But one thing that could be happening on your device is
1. Your manufacturer has an agressive power savings scheme in how the governor is set so your device is not using the full power of your chip.
2. Your device does not have enough cooling to allow your chip to run at full power and the chip is downclocking to save itself from damage.

These are the 2 most common issues phones have with emulators

As for your laptop it depends on your processor, but ypu also might want to make sure that windows power savings plan is set to performance not power savings, but it depends on the processor.