Websocket FTW!
The EVCC server supporting websocket communication - This allow the server to push data-updates as they happen, which makes polling the data by the integration obsolete.
Important
The new new communication layer, is disabled by default - if you want to support the development, I would kindly ask to go to the configuration of the integration and enable the websocket support by checking Use Websocket (experimental) - Polling Interval will be ignored. After a short while the Integration should be reloaded in HA and the integration will listen to the websocket of your configured EVCC server.
If you don't want to try the new feature - the update 'should' not harm your current setup.
Note
I have implemented this just in few hours this morning/afternoon - so there are for sure the possibility that something might not work as expected - specially this is my first websocket client implementation. So if you have issues when enabling the new feature, please create an issue and disable the Websocket support in the configuration of the integration.
Also would be quite nice to get feedback, when the websocket will work for you :-)