Syscalls can be heavier than expected. One example is when an application is run inside gVisor. Another example is when a lot of eBPF code is attached. A third

Syscalls can be heavier than expected. One example is when an application is run inside gVisor. Another example is when a lot of eBPF code is attached. A third example is when a program is run under strace. Disclaimer: I'm working on ClickHouse[1], and it is used by thousands of companies in unimaginable environments. It has to work in every possible condition... That's why we set the TZ variable at startup and also embed the timezones into the binary. And we don't use the glibc functions for timezone operations because they are astonishingly slow. https://github.com/ClickHouse/ClickHouse/ https://github.com/ClickHouse/ClickHouse/