Speed up the work of the parser of letters, otherwise it works for a very long time (primitively)

At the moment, using box as a "mailer" is quite difficult, since letters get into the box periodically with a delay, in fact, events seem to get quickly, but tasks for these events are not created so quickly (if it works by a minute cron, then this is understandable ). There is another nuance such that if there is some kind of data loading in the box (such as importing products), then the parser waits until the download is completed, that is, someone put 100,000 goods on the download and everyone was left without letters for 5-10 minutes in the box. In general, it is now all working in one thread (if I understand correctly) and this is, as it were, primitive. Make the mail parser work quickly and not depend on other crons. The same problem is with sending letters, now if someone starts a mass mailing for 10,000 contacts, then all employees will not be able to send a letter until this mass mailing is completed, and it seems to work out in 10 minutes (since the standard seems t