Depends on what you mean by "simple mode"?
Although, actually, I suspect you can't turn it off, the functionality in the issue navigator is pretty much core code and I know some of it is definitely not pluggable, so simply can't be disabled. Also, just disabling one part of it might only turn off a display, and if the performance issues are caused by another component, you'll have disabled something useful for no gain.
It might be easier to look at what your performance issues are?
By simple mode I mean /secure/IssueNavigator!switchView.jspa?navType=simple.
We found the reason of performance issue. We have some customfields, that behave like select list in issue navigator and have hundreads of possible values. JIRA, to populate /includes/navigator/filter-form.jsp with those possible values has to search all the issues of given project and issuetype. As I heard, the problem of synchronous populating the forms in simple mode is being solved in higher (we have 5.1.5) JIRA version, so that only the chosen field is being populated at a time.
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