It seems the network of roads built in the 40s, 50s and 60s just can no longer be done efficiently.
Not uniformly. New York's LIRR (90 to 95% [1]) and Metro-North (99% [2]) feature on-time rates that rival the Swiss (93% [3]).
[1] https://www.osc.ny.gov/files/reports/pdf/report-9-2025.pdf
[2] https://wpdh.com/metro-north-on-time-reliability/
[3] https://reporting.sbb.ch/punctuality?=&years=1,4,5,6,7&scrol...
> A commuter train is considered on-time by the LIRR if it arrives within 5 minutes and 59 seconds of its scheduled arrival time.
The second source doesn't say, but let's assume it's the same as for LIRR, i.e. 6 minutes.
It's also unfortunate that the SBB doesn't immediately tell us the metric, but I happen to know it's 3 minutes (more specifically 2 minutes and 59 seconds).
In other words, the LIRR permits a delay of twice the time as SBB for it to constitute late. The S-trains in Copenhagen now has a punctuality of 97% using a 3 minute metric.[0]
[0] https://www.dsb.dk/om-dsb/virksomheden/rettidighed/s-togs-re...
Not sure how you compare a small simple system like Lord which is pretty much one line with a few branches with an integrated multi-national system like the entire Swiss railway either
As for the LIRR, it seems it's only the terminal station that counts:
> Thus, a train is considered late only if it arrives at its final destination six minutes or more after its scheduled arrival time.