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There is no way how to disable only this specific Event. What you can do is to disable Interface Changed event. It means you disable all events related to change of: Interface Speed, Physical Address, MTU, Poll Interval, Statistics Collection interval, Rediscover Interval, Interface Name.
UPDATE EventTypes SET Record = 0 WHERE Name = 'Interface Changed'
As a workaround for this, using Report Writer I copied and modified the "Top 250 Events" default report. I changed it to only the top 25 messages and adding message filter that says "Select Records where NONE of the following apply: Records where Message contains Speed". Then I just customized the Home View by replacing the stock Top 25 Events resource with this custom report.
It doesn't have the colored bars based on event type but it does the job for us.