Switch tabs in my application takes too much time

Question

Hello all,

I am developing an application in Microsoft Teams that contains two static tabs. When the user wants to switch between tabs it takes approximately 20 seconds.

After an investigation, I figured out that the Teams application doesn't send the request to my application for 20 seconds, and when it does, my app responds in 200ms.

I checked what happened in the network and console tab in developer tools when I wanted to switch tabs, but nothing happened in those 20 seconds.

I also checked the Teams application's logs; I will attach them.

Teams log while switching tabs.txt

Some technical details:

Microsoft Teams version 25031.805.3440.5290 (but every client has the same issue)
@microsoft/teams-js version: 2.3.0

Tab related properties from manifest file:

{
	"$schema": "https://developer.microsoft.com/en-us/json-schemas/teams/v1.12/MicrosoftTeams.schema.json",
	"manifestVersion": "1.12",
	"staticTabs": [
    {
      "entityId": "myAudience",
      "name": "My Audience",
      "contentUrl": "https://my-domain/my-audience",
      "scopes": [
        "personal"
      ]
    },
    {
      "entityId": "myActivities",
      "name": "My Activities",
      "contentUrl": "https://my-domain/my-activities",
      "scopes": [
        "personal"
      ]
    },
    {
      "entityId": "about",
      "scopes": [
        "personal"
      ]
    }
  	],
  	"validDomains": [
    "my-domain"
  	]
}

I hope you will help me!
Please let me know if you need any additional information.

Thanks in advance,
Vuk