Having gone from self-hosted to their hosted solution with both Jira and Hipchat I really wonder why they don't seem to do better sharding. Is Jira so bad to s

Having gone from self-hosted to their hosted solution with both Jira and Hipchat I really wonder why they don't seem to do better sharding. Is Jira so bad to scale in their hosted configuration that it has to be slow for everyone? Our local jira, after some experienced tweaking, was so much more responsive... it's weird.