It's a habit that I followed in every MMORPG that I played. Whenever I saw a mining or harvesting node, I would stop and start harvesting/mining and then go on my way. I've already setup a ton of macros in Open Beta to swap between my fighting, crafting and gathering jobs, but I noticed something annoying with my two mage jobs. After harvesting and switching back to my mage job, I no longer had all my MP. The amount of MP usually drops by 150ish. The MP doesn't steadily decrease every time I swap jobs. I seem to lose the MP when I switched to the gathering job. But when I switch back, I stay at whatever the MP level was for the Gathering job. I notice that my HP does change depending on what job I switched to, but HP regenerates very quickly. MP doesn't regenerate so it feels like mages are getting the short end of the stick.