What's the plural form of lightspeed lag? Here's the word you're looking for.
Answer
The noun lightspeed lag can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be lightspeed lag.
However, in more specific contexts, the plural form can also be lightspeed lags e.g. in reference to various types of lightspeed lags
or a collection of lightspeed lags.