We utilize google calendar in our org since it sync's so seamlessly with our mobile devices.  I have google calendar two way sync enabled in zoho.  The problem is lately it's been very laggy.

Sometimes an event added in zoho will show up in seconds in google calendar, and other times it will take a long time, i'm not sure because google calendar doesn't have easily accessible time stamps for when an event is synced, but it's over 15 minutes, and maybe up to an hour.  Why is it taking so long?  And why is it inconsistent?