The current ones in place seem to make most sense to me
First I thought that the longest (shortest) titles should go first. Then, when I realized that there are a lot of them, I started to think that I should fix first not the longest(shortest), but with biggest amount of replies, as those probably perform better than short one page treads, and after fixing will perform even better. This way my fixing work would be more efficient.
But what I guess would be really efficient is to order thread titles by "impressions" under "performance" in GSC.
P.S. installed.
