1434809 - Google Spreadsheet "ProjectSheet planning" add-on's timescale change is 2-3x slower in Firefox than Chrome

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect, P3)

Description

[Chris Peterson [:cpeterson]]

I created this Google Spreadsheet using a free Google Spreadsheet add-on called "ProjectSheet planning". The add-on adds buttons and scripts to the spreadsheet. I don't know if you will need to install the add-on to reproduce this spreadsheet behavior or whether the add-on "sticks" to the spreadsheet. To install the add-on, open Add-ons menu > Get Add-ons > Search add-ons for "Gannt" and select "ProjectSheet planning"

STR:
1. Open this Google Spreadsheet:

https://docs.google.com/spreadsheets/d/1qtaDkyHHKz2JLY7zA_b7BB_LrFCK2Wi3-Zr3VZRs1bE/edit#gid=1533228141

2. Wait for the "ProjectSheet" sidebar to open on the right side of the page.
3. In the sidebar's "Set Gantt chart timescale" section, change timescale setting to "3 years per timescale" or back to "7 days per timescale".
4. Wait for the dates in rows 1 and 2 to change.

RESULT:

Simply loading the spreadsheet triggers a "A web page is slowing down your browser" warning. Changing the timescale takes 10-15 seconds and also triggers a "A web page is slowing down your browser" warning.

Changing the timescale in only takes about 5 seconds in Chrome and Edge.

Here is a link to a Gecko profile from Firefox Nightly 60:

https://perfht.ml/2GBInRI

Comment 1

[Olli Pettay [:smaug][[e-mail]]]

_Lots_ of time is spent dealing with cross-compartment wrappers.

Comment 2

[Chris Peterson [:cpeterson]]

WFM in 68 Nightly. Switching the timescale takes about 5-7 seconds in both Firefox 68 Nightly and Chrome 73.