[londons_explore]

All browsers seem to slow down with an old profile.

I suspect it's because all the unit and regression tests are run with fresh profiles, and nobody tests performance with a crufty 10 year old profile thats been through a lot of file format migrations, with highly fragmented indexes etc.

[tinyhitman]

Yeah this is likely. Not sure about other browsers but I haven't noticed any of such issues myself anymore. And hey, if it ain't broke... It would be a nice for browsermakers to implement such a testsuite tho, but until then its just too easy to just clear data. Average user has all data synced to their respective cloud accounts anyway or don't care enough.

[Lex-2008]

I believe that modern web browsers limit your history to 3 months, so it's almost like you never have a profile older than 3 months :)

[wizzwizz4]

I got quite upset when three years of browser history were wiped out by an update. A Firefox update, of all things! I still can't find the setting to restore the old behaviour.

[throwaway33ku9]

I've never experienced this.

I just checked (in Firefox) my history panel, sorted by date... Today, Yesterday, Last 7 days, This Month, a named month for the prior 5, and Older than 6 months.

And some of the randomly sampled stuff in that giant last category is quite old.