IntelliJ IDEA stalls for several minutes until hitting first breakpoint

I've experienced the problem below with several Rails projects while debugging in IntelliJ IDEA 14 Ultimate.

If I set no breakpoints and load a page through the browser, the debugger executes the code quickly and the page is loaded.

If I set a breakpoint in the Rails code (line break, not conditional) and load that same page, however, I'll see some logging activity in the debugger console and then IntelliJ will stall for SEVERAL minutes (5 to 8 minutes, if not longer), with the debugger controls still indicating that execution is active, until it finally brings up the breakpoint and indicates that execution is paused on that line.

This only happens for the very first breakpoint encountered during a debugging session. If there are other breakpoints along the way, there's no stalling. If I load the same page for a second time, there is also no stalling at that same breakpoint. If after IntelliJ stalls on a breakpoint I go on to set addtional breakpoints for other pages and load those pages, there's also no stalling.

Has anyone experienced any such issues? Any idea what could possibly cause it? I'm not sure where to start.

Thanks!