If it's a concern just use a language that's within an order of magnitude of C and don't write anything exceedingly stupid. Java, C#, Golang, and Node are all

If it's a concern just use a language that's within an order of magnitude of C and don't write anything exceedingly stupid. Java, C#, Golang, and Node are all fast enough that you could run 99.9% of the sites on the internet with a single machine.