The ckt is a trivial NPN switching ckt (attached).
Breadboard does limit the frequency. But, I observed similar behavior in simulation and bread board. Waveform started to look slopy at 150KHz on breadboard, in sim same behavior at 300KHz.
Sometime ago, I was able to get 4MHz on breadboard. I think 200KHz is far too low. You can sqeeze more if you careful with bypass caps.