Before we go further, we have to correctly disclose the parameters of the latency tests.
Lag stopwatching methods are a cesspool of multiple different opposing latency standards covering multiple subsets of the latency grain.
Latency is multiple numbers:
- Absolute latency
- Latency gradient (differences in lag between different pixels)
- Latency volatility
- Etc.
Stopwatch start varies between different websites and testers
- Frame completion stopwatching
- VBI stopwatching
- Sync technology variances (VSYNC ON, VSYNC OFF, G-SYNC)
- Etc.
Stopwatch stop varies between different websites and testers
- First faint photon visibility (e.g. GtG1% or GtG2%), often before human notices
- Full pixel completion (e.g. GtG 100%)
- GtG midpoint options (GtG 10% or GtG50%), more relevant to human reaction time
- One color test
- Averages of multiple color test (Since some colors are laggier)
- First-anywhere test (e.g. camera-base lag tests), basically, first changed pixel visible
- Etc.
Different lag stopwatching rules generates completely different numbers.
CS:GO tests button-to-pixels, which adds a lot of latency noise, so in this case, for a same rez-for-rez, same hz-for-hz, same sync tech test, so 1080p 60Hz vs 1080p 60Hz has practically no visible lag difference CRT vs lowest-lag 60Hz LCDs (not 240Hz monitors configured to 60Hz).
Now, since 1080p 240Hz CRTs do not exist, that type of lag test is impossible to achieve. However, when one breaks down the latency chain only the "frame presentation to photons" portion, the lag differnces do faintly become visible, but is only a 1-2ms time window.
You can see displaylag.com Leo Bodnar Lag Tester, but Leo Bodnar Lag Tester is a very limited "VSYNC ON 60Hz 1080p" lag test with a known VBI stopwatch start, but an unknown lag stopwatch end (GtG%). However, when it is tested on the fastest 1080p 60Hz LCDs, combined to 1080p 60Hz capable CRT, it is emitting the same lag numbers. Also since no GPUs with VGA outputs are sold anymore, so that's a testing complication too - but when Leo Bodnar lag testing a CRT, you use an adaptor, and the digitalness adds a bit of lag (albiet <1-2ms). So also extremely hard to do apples-vs-apples.
However, for apples-vs-apples (and midpoint GtGs first time where human visible), the difference becomes negligible.
Mind you, VSYNC OFF lag numbers are totally different, since that's a scanout-following latency test, where TOP = CENTER = BOTTOM rather than TOP < CENTER < BOTTOM because VSYNC OFF bypasses scanout latency.
TL;DR: Understand latency stopwatching disclosure. Most website lag tests do not disclose lag stopwatch sequence adequately. Be aware of lack-of-disclosure caveats when quoting lag numbers.