Name the stage that is slow
Observe whether you are waiting for the website, the separate game page, the forest artwork or the first response after pressing Play. Also note whether the issue happens on every visit or only after a new installation or update. This sequence is more useful than one overall impression of speed.
The game needs its program and visual assets to become usable. Offline preparation also retrieves the release’s cached files after the page loads, so the game being visible and the offline setup finishing are related but separate milestones.
Try a controlled comparison
On a stable connection, open the official game and allow it to finish loading before starting. Finish that attempt, then reopen in the same browser context. Comparing that repeat visit with the first one can help reveal whether initial downloading was the main delay.
If the page loads but movement feels uneven, note window size and whether you are using Float. Try a normal game window and close unrelated heavy activity if practical. Change one condition at a time so you can tell which comparison affected the symptom.
Keep the report useful and the save intact
Record the device, browser, online or offline state and whether the delay occurs before or during a run. A rough measured wait is more informative than a claim that the game never loads if it eventually does. Include any visible error or incomplete artwork.
Do not clear all site data simply to repeat a first-load test. That risks removing your records and forces files to download again. If another browser helps isolate a problem, remember that its separate local progress is expected and does not mean your original save has moved there.