I tried answering this question searching online and found (please forgive me) an article from the DailyMail, though I can already imagine the Toronto Sun headlines this week.
Sydney's light rail is the slowest in the world, the NSW Labor opposition has said as it slammed the tram debut as 'disastrous'.
www.dailymail.co.uk
Seems like all the same failings occurred in Sydney's LRT, reaching speeds just over 11km per hour. The Finch West LRT is doing around ~12km/h so the title for world's slowest may still be nudged by Sydney's LRT. The article is from 2019 so naturally I was curious if things got better for Sydney since.
As per below screenshot from Wikipedia, it appears they ended up removing some traffic and turn signals to speed up things. I have a feeling such improvements won't be coming along the Finch corridor.
View attachment 701327
Alas, these improvements did not seem to help with operating speeds. I looked up statistics from the transit agency and according to
here, the route (Line 2, Randwick to Circular Quay) actually went from 34 minutes (when reported at opening in 2019) to 38 minutes and 30 seconds today.
Which does not aspire me with great confidence for our line.