Fetching catalog.json takes a lot of time in che-theia

[vinayb21]

Bug Description:
When Theia is loaded, I have observed that there is a long freeze before actually fetching catalog.json file

Steps to Reproduce:

• Create a Theia IDE using che-theia image and respective che plugin registry
• Check the network tab (Chrome or firefox)
• There is a big delay before the actual fetching of catalog.json

[azatsarynnyy]

Hello @vinayb21
could you please clarify what is catalog.json file and where it fetched from? Is it related to any plug-in?
I don't remember catalog.json file being used in Che-Theia.

[vinayb21]

Hello @azatsarynnyy
In the core package of Theia, catalog.json is being fetched
https://github.com/eclipse-theia/theia/blob/57b4b671f621dc1c5c6eec7f8c6ab1fe0585e4a5/packages/core/src/browser/json-schema-store.ts#L99

[azatsarynnyy]

@vinayb21 have you observed the same behavior in vanilla Theia?

[vinayb21]

@azatsarynnyy In vanilla Theia, the waiting time is around 200-250ms

For Gitpod:

For self hosted Che-theia:

For Gitpod and self hosted che-theia:
The combined Initial connection and SSL are taking more than 1.3 seconds (waiting time is similar to plain theia)

Do you know if there is a fix for this?

[azatsarynnyy]

@vinayb21 I believe that's how azurewebsites.net responds.
I've checked it with cURL:
curl 'https://schemastore.azurewebsites.net/api/json/catalog.json' -w 'Total: %{time_total}s\n'
and got Total: 0.945549s

[vinayb21]

@azatsarynnyy Can we move this catalog.json to some CDN with lower latency. Thoughts?
curl 'https://schemastore.azurewebsites.net/api/json/catalog.json' -w 'Total: %{time_total}s\n'
For me, it's Total: 1.821044s

[azatsarynnyy]

@vinayb21 I propose to discuss it in a single place. Let's continue upstream eclipse-theia/theia#9149 as obviously, it's not Che-Theia specific.