[8.19] perf(synthetics): improve use public location logic (#229391) #230688
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## Summary + Optimize the heavy calls during rendering of Synthetics monitors overview page by memoizing the relevant calls and avoiding potential rerenders. Performance improvements speaks for themselves, attaching the context below ## Scenario With 5000 monitors - going to `app/synthetics` page - No scrolling - Just page load ### Before **M1 Mac - No throttle** <img width="787" height="166" alt="Screenshot 2025-07-24 at 5 39 02 PM" src="https://github.com/user-attachments/assets/8e48f060-ac13-4a64-88a3-48e9a4d1cda6" /> **Slowdown on 1x throttled M1 Mac** <img width="645" height="218" alt="Screenshot 2025-07-24 at 5 43 31 PM" src="https://github.com/user-attachments/assets/e9928a5d-da61-4ac2-b1bd-a99ca156eb7f" /> **Midtier desktop/ Highend Mobile** <img width="702" height="210" alt="Screenshot 2025-07-24 at 5 42 30 PM" src="https://github.com/user-attachments/assets/2c53c560-4f56-4182-9c5d-20a350c676f1" /> ### After **M1 Mac - No throttle** <img width="677" height="132" alt="Screenshot 2025-07-24 at 4 56 54 PM" src="https://github.com/user-attachments/assets/f35b61cd-91d0-4c43-8d73-068d498009cd" /> **Midtier desktop/ Highend Mobile / Slowdown on 1x throttled M1 Mac** <img width="509" height="126" alt="Screenshot 2025-07-24 at 6 01 38 PM" src="https://github.com/user-attachments/assets/0f5b6125-db31-49e5-a024-2629e8db55ca" /> ### Checklist Check the PR satisfies following conditions. Reviewers should verify this PR satisfies this list as well. - [ ] Any text added follows [EUI's writing guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses sentence case text and includes [i18n support](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md) - [ ] [Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html) was added for features that require explanation or tutorials - [ ] [Unit or functional tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html) were updated or added to match the most common scenarios - [ ] If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the [docker list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker) - [ ] This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The `release_note:breaking` label should be applied in these situations. - [ ] [Flaky Test Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was used on any tests changed - [ ] The PR description includes the appropriate Release Notes section, and the correct `release_note:*` label is applied per the [guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process) - [ ] Review the [backport guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing) and apply applicable `backport:*` labels. --------- Co-authored-by: vigneshshanmugam <vignesh.shanmugam@elastic.co> Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com> Co-authored-by: Shahzad <shahzad31comp@gmail.com> (cherry picked from commit 93daf0d)
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