“We couldn't bundle your scripts quickly enough.”

I get this message about 50% of the time, with the identical script and website (just merely click the PREVIEW button!): I understand that there is a 15-second time-out. But this message sometimes shows and sometimes not (e.g. in different time of day).
Am I under the mercy of the Wix servers’ speed OR I have to upgrade my office’s internet speed???
This message comes up so inconsistently that I feel like I’m in a lottery draw…

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