Angular 4 application slows down over time

Question

Hello. I have an Angular 4.3.5 application that slows down when used after a time (~20 minutes).

My scenario is more or less like this:

• Rest API and Angular static files are on a Raspberrypi B 3
• Approximately 30 Raspberrypi B 3 access the Angular application through Chromium (versions 58 and 60)

What happens:

• Angular HTTP requests get slower as time goes on. Example: from ~100 ms to 2 seconds

Additional information:

• If I press F5 on Chromium the Angular application returns to normal
• Angular uses this template https://themeforest.net/item/primer-angular-2-material-design-admin-template/19228165
• Angular uses an app for Google Chrome/Chromium, which I wrote, to communicate with an Adian through the serial port (Chrome Apis that I use: Chrome.runtime.sendMessage, Chrome.runtime.connect and Chrome.serial)
• The clients, Raspberrypi, have available features (CPU and memory) when the application gets slow
• The Angular application stores almost nothing in the browser