perf: parallelize mobile workspace fetch (Closes #1116)

tests/e2e/test_mobile_home_bootstrap_release.py

@@ -29,6 +29,7 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
     browser_errors: list[str] = []
     failed_responses: list[str] = []
     workspace_requests: list[str] = []
+    launch_transfer_events: list[str] = []
     live_requests: list[str] = []
 
     try:
@@ -38,6 +39,18 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
                 viewport={"width": width, "height": height}, ignore_https_errors=True
             )
             page = context.new_page()
+            cdp = context.new_cdp_session(page)
+            cdp.send("Network.enable")
+            cdp.send(
+                "Network.emulateNetworkConditions",
+                {
+                    "offline": False,
+                    "latency": 100,
+                    "downloadThroughput": 48 * 1024,
+                    "uploadThroughput": 48 * 1024,
+                    "connectionType": "cellular3g",
+                },
+            )
             page.on("pageerror", lambda error: browser_errors.append(error.stack or str(error)))
             page.on(
                 "console",
@@ -53,9 +66,16 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
             )
             page.on(
                 "request",
-                lambda request: workspace_requests.append(request.url)
-                if "feature-today-timer-" in request.url
-                else None,
+                lambda request: (
+                    workspace_requests.append(request.url),
+                    launch_transfer_events.append("workspace-requested"),
+                )
+                if "feature-today-timer-" in request.url else None,
+            )
+            page.on(
+                "requestfinished",
+                lambda request: launch_transfer_events.append("core-finished")
+                if "/runtime-" in request.url else None,
             )
             page.on(
                 "request",
@@ -69,6 +89,9 @@ def test_release_artifact_bootstraps_mobile_home_and_returns_from_insights(
             page.locator('input[name="access_token"]').fill(ACCESS_TOKEN)
             page.locator("#submit-sign-in").click()
             page.wait_for_url(origin + "/", wait_until="networkidle")
+            assert launch_transfer_events.index("workspace-requested") < (
+                launch_transfer_events.index("core-finished")
+            ), launch_transfer_events
 
             expect(page.locator("#my-work-status")).to_contain_text("2")
             initial_live_requests = len(live_requests)