Improve hot reload speed and process to enable fast development-test cycle

THIS ISSUE WAS FIRST FILED TO PANEL HERE https://github.com/holoviz/panel/issues/849

BUT I WAS INFORMED ITS A FEATURE REQUEST FOR BOKEH

System Info

• Panel: 0.7.0
• Bokeh: 1.4.0
• Python: 3.7.4
• OS: Windows 8.1
• Browser: Chrome

My Pain

When developing apps in Panel if often wan’t to see how the change looks. It’s possible to do by using the --dev flag but

• The restart of the Panel/ Bokeh server is very slow compared to the alternative technologies of Streamlit and Angular that I’m used to.
• The browser window does not automatically reload. I have to wait for the bokeh server to reload and then I can click refresh. In Streamlit and Angular I do not have to do this. I don’t have to do this when I work with Sphinx either.

(Note I have to run panel server as a python module in order for reload to work on windows).

Solutions

• Improve restart time for Panel/ Bokeh server
• Enable automatic reload of the browser.

I believe enabling automatic reload of the browser alone would be very, very valuable if its difficult to improve the restart time for the Panel/ Bokeh server.

[bryevdv]

well I certainly want to make opportunities and space for new contributors, for sure, but in this case it’s also a matter of very limited bandwidth on our end. With all the other 2.0 work ongoing I doubt this will be able to be prioritized until at least a few months in to 2020 or later (just setting expectations).

[MarcSkovMadsen]

Working on a workaround for this (and other things) in Panel here https://discourse.holoviz.org/t/awesome-panel-designer/643/3 to speed up my development experience.