Depends on what the multiplicand is.

Not really.

For most apps it’s much less than that and in most cases it’s unnoticeable. I think it would be more productive if you could point out an app that has noticeably worse performance on FillC, so that the cause for that could be looked at and perhaps even fixed, so that eventually there would be neatly zero examples like that.

The fact that inserting runtime checks and doing garbage collecting slows things down is not a bug, not something that needs to be fixed.

As for "I think it would be move productive if you ...", that's just rude. I wasn't criticizing Fil-C, just pointing out an inaccuracy.

You did not point out any inaccuracy, you literally made baseless comment about it being "up to 5 times" slower without providing an example where that's the case.

"That's just rude" - oh my, never though asking for evidence of a performance problem on HN would be "rude". And yes, if something is actually 5x slower, it's very likely a performance bug that can be fixed, as FillC's author has made it clear in several opportunities.

> you literally made baseless comment

It's sad that people lie here. It's commonly recognized that programs run 1.5-5 times slower.

> if something is actually 5x slower, it's very likely a performance bug that can be fixed, as FillC's author has made it clear in several opportunities.

Another lie from someone who doesn't even know what the program is called.