I couldn't find where the times for each time zone was posted when I went looking for it on Tuesday. But I put in my calendar to start checking at 09:00 (CST), when I turned on the desktop computer the only shops available were Eastern time shops. And it was running very smoothly, I grabbed the GA shops I wanted and I waited for 10:00.
At about 10:05 I opened up the website again, and smooth was NOT what I experienced. I restarted the computer, I restarted my phone (because it's my internet source here at home), I disconnected the tablet from the hotspot to make sure I was getting all of the available signal. ALL of the other websites I visit regularly were working just fine and even quicker than normal. I eliminated everything that could have been an impediment, or at least everything under my control.
On CX Group's website I could open a shop, wait for it to populate, then wait longer for it to "check availability" and then pick my date, then wait even longer for the email to come through to add it to my calendar. What normally, even with the glitches, takes about 40 minutes took more than an hour. But, I did get all of the shops that I wanted, which doesn't always happen.