Lag with a large number of players (700+) (And teleport bugs)

[ZbyK]

Hey,
For several weeks I have a lot of problems with lag on our server when it is full (700-800 players). I have made every effort to get rid of the problem. Unfortunately, the server situation has still not changed. The problem is I don't know what I can do to improve the situation. Statistics (server info in perfomance browser) dont show server overload. Below are some sample screenshots of server info.
 

Spoiler

server specification:
CPU: Intel Xeon-E 2288G (4.8GHz Turbo Boost)
Bandwidth: 1 Gb/s
Memory: 64 GB RAM
SSD NVMe


In addition, we encounter major synchronization problems (which leads to bugs). For some players, the vehicle stands in one place for several minutes, while in others it drives and synchronizes on a regular basis. The player entering (or onto) the vehicle he is standing at can teleport. Examples in the spoiler.

Spoiler

Teleport: 

Screenshots taken at the same time on two computers:

Situation 1; Computer 1

Situation 1; Computer 2


Situation 2; Computer 1

Situation 2; Computer 2

Thank you in advance for your reply and help.

Edited April 5, 2020 by ZbyK

[ZbyK]

Here is another example from players. This time the two see exactly the same.
https://i.imgur.com/gW2j4Ps.mp4

I also attach the results from the shownetstat.

Edited April 6, 2020 by ZbyK
+ net stat