Our job is parsing both GNU C Compiler 4 (gcc) and IAR Compiler (C/C++) warnings. GNU parsing takes only few seconds but IAR parsing is very slow (about 25min). Console log looks like following:

09:46:43 [WARNINGS] Parsing warnings in console log with parser GNU C Compiler 4 (gcc)

09:46:48 Skipping warnings blame since Git is the only supported SCM up to now.

09:46:48 [WARNINGS] Parsing warnings in console log with parser IAR Compiler (C/C++)

10:11:41 Skipping warnings blame since Git is the only supported SCM up to now.

10:11:41 [WARNINGS] Ignore new warnings since this is the first valid build

10:11:41 [WARNINGS] Plug-in Result: Success - no threshold has been exceeded

With warnings plugin version 4.57 IAR parsing takes less than second. Not sure if it can be that fast either. Console log is:
13:47:49 [WARNINGS] Parsing warnings in console log with parser GNU C Compiler 4 (gcc)

13:47:55 [WARNINGS] Parsing warnings in console log with parser IAR Compiler (C/C++)

13:47:55 [WARNINGS] Computing warning deltas based on reference build #8

13:47:55 [WARNINGS] Ignore new warnings since this is the first valid build

13:47:55 [WARNINGS] Plug-in Result: Success - no threshold has been exceeded

Only change between those builds is warnings plugin version. I see there has been made improvements to IAR parser in version 4.63 but I guess parsing shouldn't take that much time. Console log size is 29MB.

There are no warnings found in any build so can't be sure how different versions of plugin works.