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When JSP breakpoint is set by first time after start IDE, the response is very slow. Probably problem is, that the java parser is initializing, because no java source code is opened in editor.
The parser creates FileSystem objects for the system's classpath so it can quickly lookup classes at the time of parsing. This is done during the first parse request. If you didn't edit any Java file and didn't expand any Java source node, then the parser was uninitialized until the Debugger tried to find a class appropriate for the breakpoint's line and posted a parse request.
Background pre-initialization would probably introduce more problems than the current behaviour.