Editing a large PHP file, using {, }, (, ), or comma causing DW to lock-up

I have a PHP file totalling around 7,000 lines of code. When I write { or }, ( or ), or a comma, at any point in the file, DW locks-up for a few seconds, then continues. This has been happening ever since I started using Dreamweaver CS4 - it never occurred with older versions.
Any ideas?
[Post moved to more appropriate forum -Forum Moderator]

I don't have PHP files that are as long as that, so have no way of testing. However, one possibility is that Syntax Error Alerts are turned on. Dreamweaver CS4 doesn't check for PHP syntax errors; the syntax checker is for JavaScript. However, having the option turned on might cause the problem, because PHP and JavaScript both use braces and parentheses. Try turning off real-time syntax checking. It's toggled on and off by clicking the button in the Coding toolbar, as shown in the following screenshot:
When turned on, the button looks pressed in like the two immediately above it in the screenshot.
If that doesn't improve the situation, I suggest that you file a report to the Dreamweaver engineering team through the bug report form at http://www.adobe.com/cfusion/mmform/index.cfm?name=wishform. Give as much detail as possible to help the engineers try to reproduce the problem.

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