Laravel - Fullcalendar Loading Speed Issue for 2K+ events

Question

I am using Fullcalendar for my app and i'm having trouble displaying the necessary events for display on calendar.

I display calendar as below;

        $calendar = new Calendar();
        $calendar
        ->setOptions([
            'plugins' => ['window.interaction', 'window.dayGridPlugin', 'window.timeGridPlugin', 'window.listPlugin'],
            'locales' => 'window.allLocales',
            'locale' => config('app.locale'),
            'events' => [
                'url' => route('project_eventsJSON', ['project' => $project]),
            ],
            'firstDay' => 1,
            'timeZone' => 'local',
            'displayEventTime' => true,
            'selectable' => true,
            //'initialView' => 'timeGridWeek',
            'headerToolbar' => [
                'left' => 'prev,next today',
                'center' => 'title',
                'right' => 'dayGridMonth,timeGridWeek,timeGridDay'
            ],
        ]);
        $calendar->setId('1');
        $calendar->setEs6();
        return $calendar;

and my events route as below;

public function CaleventsJSON(Project $project) {
        $events = [];
foreach ($req->planneddates as $date) { 
  $event = [
                    'id' => 1,
                    'title' => $name,
                    'start' => $fullparsed,
                    'end' => $fullparsed,
                    'allDay' => true,
                ];
                $events[] = $event;

}
return response()->json($events);
}

Number of events is now more than 2K, i end up with crazy loading times... it takes almost 20 seconds until the events show up on calendar.

I see from my devtools that my events route(shown above) is being called as below;

EventsJSON?start=2022-01-31T00%3A00%3A00%2B03%3A00&end=2022-03-14T00%3A00%3A00%2B03%3A00

start and end dates have no effect, route still loads events from 2 years ago... i dont think i am using this correctly... how could i optimize it so that i am not loading all events and just load the events needed for display?

Thanks