Zabbix http pollers are busy above 90% even after increasing their amount

[xexillia]

Hello everyone!
I have Zabbix 5.0.18 with a few proxies, divided by roles. One of the proxies has the HTTP-poller role. Its stats are as follows:

Mode	Encryption	Compression	Last seen (age)	Host count	Item count	Required performance (vps)
Active	Cert	On	6s	2257	88473	1030.87

Recently, I created a new web scenario with 3 steps for 1500 hosts. My HTTP pollers, initially set to 100, became 90% busy. I increased their number to 300, but the performance did not improve well:

I noticed that the poller processes are not busy at all.

I cannot upgrade my instance to 7.0, where the MaxConcurrentChecksPerPoller setting is available, but I don't understand how to reduce the busy percentage.

[cyber]

What do you mean "not busy at all"... most of them say " getting values"....

I would say, this proxy is already overloaded... Usually it is said, that proxy is good for 6-700 nvps... sometimes a bit more.. You have already over 1000 and adding more... Split it up to different proxies.