The configurable speed settings don't seem to actually take effect--that is to say, the speed always defaults to 1200 even if you enter a different number in module config.
Visit /admin/config/user-interface/back_to_top and enter a number other than 1200 in the Speed field (for example: 9999); visit a page on which the Back to Top button is enabled and click the button: your custom speed value will not take effect.
Alternatively: if you place a breakpoint at line 58 of back_to_top.js and then, after clicking the Back to Top button, console.log the speed variable, you will get a value of 1200 regardless of the value set in module config.
Update JS so that the settings.back_to_top.back_to_top_speed is properly populated.
Active
3.0
Code
Hi, I got the settings speed in js while console.log(speed) after line no 54. I’ve added a patch to handle the condition when the speed value is null. Please review it.
Tested the patch as working per expectations. Thanks for the fix!