Webserver: some requests are taking forever while all others are handled super fast - reason?

I'm hosting an online forum on this server:

Intel® Core i9-9900K (8 core) 128gb RAM NVMe SSD 2x1TB


running Ubuntu. I'm using Plesk for webserver configuration. My online forum is completely developed by me in PHP and JS. The site is using web-sockets for logged in users for chatting etc. I'm running the default configuration of Plesk for the most part with Nginx handling static files and otherwise forwarding the request to Apache. As explained by Plesk here.

I use the default nginx config with 1 worker_process and 1024 worker_connections. On PHP-FPM I use pm = static, max_requests = 2000 and max_children = 500. I have more than enough RAM left running the forum and also the CPU stays below 40% workload all the time.

Now the problem: Visiting the site on any browser works just fine. But then out of 20-30 ajax requests one just takes waaaay too long. Like every ajax request gets an instant answer and from time to time one takes >10 seconds, a few forever. And I have no clue why. I looked through nginx and website error logs and cannot find any answer to this problem.

I would be very happy about any possible hint. I know it's hard to guess based on the little information. But maybe someone here experienced something similiar?


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- Intel I210

HDD1x HDD SATA 4,0 TB Enterprise

HDD2x SSD SATA 480 GB Datacenter ( would be fine if the 2 sata drives were changed to 1 ssd drive of 2 tb's)

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Free Memory 1908640 kB
Total Swap Memory 4194300 kB
Free Swap Memory 3246332 kB
System Uptime 277 Days, 6 Hours and 36 Minutes
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DirectAdmin 1.59.5 Running
Exim 4.92 Running
MariaDB 10.2.29 Running
Named 9.11.4 Running
sshd Running
dovecot 2.3.6 (7eab80676) Running
pure-ftpd 1.0.49 Running
Php 7.3.12 Installed
Php 5.6.40 Installed (php2)


Used
Disk Space (mb) 277671
Bandwidth (gb) 930.2369
Domains 60
Users 29
Resellers 0



IPv4 Network Subnet /27 (29 usable IPs)

IPv6 Network Enabled

Root Access to the server

Cloudflare CDN

HTTPS for websites

Fully Managed & Secured

Automated 24/7 Monitoring

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I have been hetzner customer for past 2 years. i run online online academy (online classes), for which i am using bigbluebutton.
monthly Bandwidth consumption is <1TB.
Processor EV-3 4 cores 8threads
32gb ram ECC
1gb NIC
raid 1 3TBx3

my only purpose of having dedicated server was dedicated 1gbps port that can handle over 60 concurrent users.

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i have contacted hetzner and they have said that their network is running fine.

I have done few checks and it shows

root@Ubuntu-1604-xenial-64-minimal ~ # speedtest-cli
Retrieving speedtest.net configuration...
Retrieving speedtest.net server list...
Testing from Hetzner Online GmbH (144.76.12.109)...
Selecting best server based on latency...
Hosted by fdcservers.net (Frankfurt) [143.90 km]: 5.964 ms
Testing download speed........................................
Download: 727.16 Mbit/s
Testing upload speed..................................................
Upload: 278.80 Mbit/s

|------------------------------------------------------------------------------------------|
| WinMTR statistics |
| Host - % | Sent | Recv | Best | Avrg | Wrst | Last |
|------------------------------------------------|------|------|------|------|------|------|
| broadcom.home - 0 | 792 | 792 | 3 | 5 | 171 | 6 |
| 182.176.1.48 - 3 | 728 | 711 | 23 | 28 | 96 | 24 |
| 182.184.9.34 - 4 | 709 | 686 | 24 | 35 | 168 | 26 |
| 182.184.3.149 - 4 | 689 | 662 | 34 | 39 | 74 | 48 |
| 10.253.4.120 - 4 | 690 | 663 | 34 | 39 | 87 | 45 |
| 10.253.4.4 - 3 | 713 | 692 | 35 | 41 | 202 | 41 |
| decix-gw.hetzner.com - 3 | 716 | 696 | 145 | 152 | 214 | 170 |
| core23.fsn1.hetzner.com - 29 | 375 | 268 | 0 | 154 | 195 | 165 |
| ex9k1.dc10.fsn1.hetzner.com - 3 | 715 | 695 | 149 | 156 | 349 | 153 |
|static.109.12.76.144.clients.your-server.de - 3 | 735 | 720 | 149 | 155 | 304 | 168 |
|________________________________________________|______|______|______|______|______|______|
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Hetzner is saying that problem is out of their network so they cant do anything.
what should I do? should i shift to other host in USA or Canada? My current server is germany.
can anyone suggest affordable host <50USD

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<<snipped>>