There’s a brand new LifeMap delivery system that is now enabled for all subscribers. This update handles your activity data in a completely new way, which provides:
Wildly faster LifeMap loading
Way more usable when there are too many a lot of activities to display on the map
The ability to filter your LifeMap with custom start/end dates
Hover over your LifeMap to see a popup with that activity’s date
The hover now also highlights that entire activity by increasing its line width and changing its color
Click on the activities to be taken to their page
This change also affects your activity map that’s shown on your city pages.
If you have any issues, I would appreciate it if you posted in #support instead of replying here.
Correct - I’ve left that map_beta page in place, because I may do more betas in the future. Right now, that page should display an alert that directs you to remove the _beta from the URL.
I encountered the mouseover function in the lifemap and then came over here looking for the announcement thread. I have to say, this is really well done. Seems like you’ve finally cracked the nut in browser performance.
In my experience, the on-hover tends to put a lot of load on my CPU & my fan turns on - at least for larger maps. Have you experienced this?
alert:
The new LifeMap has a completely new data source. Instead of requesting an encoded polyline for each activity from the database & decoding those in the browser … I’m generating mbtiles files and serving those as vector tiles into Mapbox with a slightly modified version of GitHub - tobinbradley/mbtiles-server: A very simple node.js server for mbtiles
I have run into difficulty with the stability of this new structure. My use-case of serving hundreds of mbtiles files is not common, and I’m learning a bunch about open file limits and memory usage but I am making progress towards a solution.
The Beta: LifeMap performance has completed! 
alert:
but I am making progress towards a solution.