CruiseControl's (V2.5) Jetty collapse on processing big log files in "Test Results View"

Having big logfiles (2MB and up) from a cruisecontrol job which have many fails in there junit test part lets the conversion to html stop either with no output or normally after an refresh a broken output in a textual style (not html). Seems to be an "out of memory" problem of the vm, but setting memory to a higher value (i.e. 1024M) does not help. Smaller files (i.e. 512k) are no problem for the process

I've no idea, what todo besides giving more (and more) memory to the engine, Maybe the memory isn't the problem, but the process must be configured to get work for all file sizes