# P2 USB Serial is very slow compared to Photon **URL:** \ **Category:** Device OS\ **Created:** [October 4, 2022, 12:08pm UTC](https://community.particle.io/t/p2-usb-serial-is-very-slow-compared-to-photon/63270 "2022-10-04T12:08:06Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![sebkopf](https://avatars.discourse-cdn.com/v4/letter/s/c4cdca/32.png) [@sebkopf](https://community.particle.io/u/sebkopf)\ **Post date:** [December 18, 2023, 8:25pm UTC](https://community.particle.io/t/p2-usb-serial-is-very-slow-compared-to-photon/63270/13 "2023-12-18T20:25:39Z")
Hi @rickkas7 I was wondering if there has been any updates on this issue? Comparing the serial output between Photon 2 and Photon 1, I still get a \> 20 fold slow down in Photon 2 vs 1 with \> 5ms compared to ~250 µs (details below) for a log message. I'm assuming this is still the same buffer issues you explained in this thread and was hoping there might be a way for solving this more generally, Or if not, could you kindly point out a good way to use your solution with the `SerialLogHandler` (recommend instead of `Serial` in the particle docs)? Note on context: running a stepper motor at a range of speeds up to pretty fast rates (requiring ~1 step / ms) which used to be no problem but now the Serial debug messages cause the stepper to skip. Thank you for all your help! Photon 2 (firmware v. 5.6.0): ```auto 0000010907 [app] INFO: log message took 5563 microseconds 0000011913 [app] INFO: log message took 5723 microseconds 0000012918 [app] INFO: log message took 5370 microseconds 0000013924 [app] INFO: log message took 5310 microseconds 0000014929 [app] INFO: log message took 5520 microseconds ``` Photon 1 (firmware v. 2.3.1): ```auto 0000008089 [app] INFO: log message took 220 microseconds 0000009090 [app] INFO: log message took 225 microseconds 0000010090 [app] INFO: log message took 220 microseconds 0000011090 [app] INFO: log message took 261 microseconds 0000012090 [app] INFO: log message took 220 microseconds ``` Generated with this slightly adapted version of your code: ```auto #include "Particle.h" SYSTEM_THREAD(ENABLED); SerialLogHandler logHandler; void setup() { } void loop() { static unsigned long lastRun = 0; unsigned long start = micros(); Log.info("log message took %lu microseconds", lastRun); lastRun = micros() - start; delay(1000); } ``` --- _[View the full topic](https://community.particle.io/t/p2-usb-serial-is-very-slow-compared-to-photon/63270)._