After the update to 4.31, the standard Print Widget is really slow to load (23 seconds). You can see it on the ESRI Sandbox: https://developers.arcgis.com/javascript/latest/sample-code/sandbox/?sample=widgets-print
Changing back to use 4.30, the Print Widget loads much quicker (8 seconds).
I presume/hope ESRI are aware? But some sort of response to know that this is in hand would be really helpful.