What map are you using? Do you see any errors in the browser console?
By the way, new web app will have clustering and virtual tables to help with performance issues when you have large number of devices.
I have configured a custom layer as described in this link: https://www.traccar.org/map-layers/
In the browser console I get the following:
The new web app that you tell me, do you mean the modern traccar or the latest version of the web traccar?
Hello!
I downloaded the latest version of traccar 4.13 and I have the following results:
When zoomed out the map goes blank.
As I mentioned, you should try the modern app from master branch.
Hello!
I have the traccar installed on a server hosted in AWS with the following characteristics: Ubuntu 18.04.2, Postgresql 10.15, 16 VCPUs and 64 in RAM. I have optimized the server with the following link https://www.traccar.org/optimization/.
Also I have about 500+ devices reporting, and when the web page loads the devices do not move and the map does not render completely, is there any way to optimize the web page? Or any recommendation that you can give us.
Sometimes, I have the following problem (the page collapses and cannot work):

We also tried testing without the traffic layer and got the same result.