[GitLab] Issue creation modal takes too long to load

[InterstellarStella]

Environment

SaaS (https://sentry.io/)

Steps to Reproduce

1. Have a GitLab org with many projects
2. Integrate it into Sentry through the GitLab integration
3. Link Sentry projects to GitLab repositories
4. Pick an issue in Sentry and try to create/link it to a GitLab issue

Expected Result

The modal loads immediately.

Actual Result

The modal takes 19s (or more) to load.

• The customer has checked the logs for Chrome and the DNS AdBlock - neither are slowing down or denying access to any requests.
• In incognito mode with no browser extensions it is exactly the same.
• The network is 1GBps, with 6ms latency, tested on their machine using fast.com
• No VPN
• Nothing in any firewall rules that could be causing the response time from Sentry's end to be slow

Org and video repro in the shadow ticket as I couldn't reproduce the issue on my end when trying to create a GitLab issue in the customer's org.

Product Area

Settings - Integrations

Link

No response

DSN

No response

Version

No response

[getsantry]

Auto-routing to @getsentry/product-owners-settings-integrations for triage ⏲️

[InterstellarStella]

https://sentry.zendesk.com/agent/tickets/145671

[sentaur-athena]

I added this to our backlog but considering the current priorities we're getting to issues slower than usual. I will update with timelines when we have one.