Convert from critical to normal to conform to bko usage.
Tested in Latest Revision(Git commit beebf480a6b044ad95e998e94a1693bc5c73703f). In this no crash is observed while opening and closeing large documetns.
*** This bug has been marked as a duplicate of bug 282462 ***
ups, choosed wrong duplicate bug-number. Correct one now. *** This bug has been marked as a duplicate of bug 275065 ***