2) do you start MT yourself by clicking on an icon, or do you have Windows Task Scheduler start it? this might seem like a trivial question, but it actually has big performance implications
3) what datafeed are you using?
4) Do you have a lot of charts open? One thing that happens right at 9:30 is that the charts have to be fully redrawn to hide premarket data if the extended hours setting is set to anything other than ALWAYS or NEVER.
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