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Clicking "Play" on the launcher page results in a really slow response. It takes more than 2 seconds for the log-in window to pop and there is no visual feedback to let the player know that the application has responded to their input. Generally you want no longer than 1 second of delayed feedback (ideally there would be zero) so that the player doesn't think their click has failed or the client has frozen.
This is on the MacbookPro I posted in the official specs thread, which has 4GB of RAM. This may be a longer delay on slower machines.