poller stick to 100% busy if there are a lot of dynamic index items

Poller stick to 100% busy after restarting Zabbix server if there are a lot of dynamic index items. According to attached screenshot, there are 10000 dynemic index items, poller stick to 100% busy for 20-25 minutes.

Poller does not have shared cache for dynamic index at this moment, so there is no way to avoid this problem for large environment.