Reduced ops yield

app/src/main/java/eu/faircode/email/ServiceSynchronize.java

@@ -138,7 +138,7 @@ public class ServiceSynchronize extends ServiceBase implements SharedPreferences
     private static final int FETCH_YIELD_DURATION = 50; // milliseconds
     private static final long WATCHDOG_INTERVAL = 60 * 60 * 1000L; // milliseconds
     private static final long OPS_YIELD_INTERVAL = 15 * 1000L; // milliseconds
-    private static final long OPS_YIELD_DURATION = 1000L; // milliseconds
+    private static final long OPS_YIELD_DURATION = 500L; // milliseconds
 
     private static final String ACTION_NEW_MESSAGE_COUNT = BuildConfig.APPLICATION_ID + ".NEW_MESSAGE_COUNT";