For example, following issues seem to be persistently existing: Bug ID: 6566201 JNLP ClassLoader performance degraded in 1.6 significantly for the signed(?) jar Bug ID: 6532373 xcb_xlib.c:50: xcb_xlib_unlock: Assertion ’c->xlib.lock’ failed. First issue means huge slow down in webstart application startup. When doing some profiling in webstart started application, it’s consuming huge amount of memory … Jatka artikkelin JDK 6…, improvement over JDK 5…, not lukemista