So, basically all my events(there's min. 360 of them) have `team1 vs. team2` or `- vs. team2` or `team1 vs. -` placeholders.
 And on the initial render events change color depending on whether the event has one or two teams. 
Orange color for the one team , and green for the two teams. Also, the event changes color on click.

But mostly, I'm interested in increasing performance with rendering events.

Rendering performance is going really bad in fullCalendar, and I couldn't find any solution to this problem. 

So here's my code:

```
eventRender: function (event, element) {
                $(element).append((event.teams[0] != null ? event.teams[0] : '-') + '</br> vs. </br>' + (event.teams[1] != null ? event.teams[1] : '-'));
                if (event.teams.length === 1) {
                    $(element).css('background', 'orange');
                }
                else if (event.teams.length > 1) {
                    $(element).css('background', 'green');
                }
            }  

```

My main issue is that when I click on event to change its color, the script automatically goes to the `eventRender` or `eventAfterRender` event, and its behavior is exactly like the `for` statement - it iterates over events and then it does the stuff that I want to do with the individual event, but only when the loop lands on the clicked event. 

Also, in the `eventClick` I've called `$('#myCalendar').fullcalendar('updateEvent',event)` and I think there is a bug, because it automatically goes to the `eventAfterRender` or the `eventRender`, iterating over the whole events collection again. 

Even tough `'updateEvent'` parameter should instruct fullCalendar to update/render only the specific event.

Does anyone have any advice on this subject?