I started using Summit a week or two ago, and I really like it. It’s a great Lemmy app. But I notice my phone’s battery life has taken a hit since then.
According to battery usage, I’ve been using Summit slightly more than the Reddit app, but Summit has consumed much more battery.
One other thing. It looks like Graphene OS does not come pre-installed with Google Play Services. Summit uses Crashlytics for crash reporting which is part of Firebase which uses Google Play Services. I wonder if this is causing issues. You can also try disabling Firebase within the app. To do so go to Settings > Logging > Log crashes to Google Firebase. Let me know if this helps.