Quote from unknownna
And it seemingly only lags if cl_capfps is set to 1.

//==========================================================================
//
// Delete old content if number of lines gets too large
//
//==========================================================================

void FConsoleBuffer::ResizeBuffer(unsigned newsize)
{
    if (mConsoleText.Size() > newsize)
    {
        unsigned todelete = mConsoleText.Size() - newsize;
        mConsoleText.Delete(0, todelete);
        mBufferWasCleared = true;
    }
}

Quote from unknownna

Quote from Graf Zahl

Quote from unknownna
However, it takes ages for it to generate an error report now if the console was full of stuff before the crash occurred. But I suppose it's fine for most cases though. It'll only take a while if it crashes after hours of play.

Out of curiosity, how long does it take? Several seconds, a minute or even more?

It took around 36 seconds for it to generate the report when crashing after having copy-pasted the command in the OP. That's the equivalence of having played for around 1.5-2 hours on a high-intensity Zandronum CTF server I think.