What day is the laggy map on? As the game progresses and more units populate the map, more resources are in turn demanded by that map. Older maps may sometimes run slower than newer ones for that reason.

The possible fixes would probably include:
1. Clear cache,
2. Restart device,
3. Stop any apps running in the background,
4. Use an alternative browser, or
5. Purchase additional RAM.

Hi @Eternus we had a heavy server load spike on one of the machines yesterday, all should be sorted now. If you're still having issues please let me know (ideally using the ingame bug report )

solved and closed

UPDATE: we are in turn (slowly and in a controlled fashion) restarting all servers. We have reset some but not all to this point - it is ongoing.

Apologies if your server was not yet rebooted, it should happen either today or tomorrow.