It could go either way, but intuitively I think it's much more common that the anti-anti-bacterial mechanisms have negligible costs. Just like software doesn't

It could go either way, but intuitively I think it's much more common that the anti-anti-bacterial mechanisms have negligible costs. Just like software doesn't usually face sudden new performance issues when vulnerabilities are patched. Sure, openSSL is technically slower once they patched heartbleed, but not much slower. Certainly not enough to be a factor in anyone's decision of whether to use it. I'm also a complete layperson to the topic, as you may have guessed already.