serious performance issue.

[bsutton]

I'm building a web component to set a companies office hours.

The component uses use a pair of vaadin-time-picker components for each day, so I have a total of 14 time pickers on the page.

My java class (HoursForDays.java) binds to the pickers via the @id annotation.

If I remove the @id bindings the page loads in about 350ms (using chrome performance tool).

If I add the @id bindings back in then the load time (to first render) blows out to 6 seconds.

If I replace the time-pickers with combo boxes (just as an experiment) then even with the @id bindings the page loads in under 1 second.

There appears to be a significant problem with binding the vaadin-time-picker to a java class.

I've attached the relevant files.

sample.zip

[ThijsMaenhout]

Probably this is related to FormatTime & _GenerateDropdownList very slow vaadin/vaadin-time-picker-flow#99

[web-padawan]

Should be fixed by #111. Please submit another issue if you still experience performance problems.