What's the point of this topic? What is the problem with performance? Have you submitted your feedback previously?
By the way, the legacy app is still available if you prefer it.
In previous versions it was easy to make updates, change colors, put logos, etc. In these versions it is necessary to make modifications in React to change a color and have to compile, and the drivers for SQLSERVER do not work from traccar server, it is just a comment, I wait for version 5.5 to see if these small problems are corrected
How any of that is related to the performance?
React is much easier to work with than Sencha. Pretty much everyone will agree with that. It's also more open and better license. Basically it's better in almost every way.
MS SQL drivers work just fine in all recent versions.
It is a pity that in the latest versions of Traccar they do not give the performance of before, since they started with the modern version, and they forgot about the original version of Sencha until version 5.0 traccar worked correctly, too many errors in their new versions! , a comment with much respect.