No its not.

Neruina wraps vanilla's tick methods, profilers like spark do not understand this and then attribute everything that ticks to Neruina which are in fact owned by minecraft, expanding the stack in spark will show you this.

If you create an issue saying Neruina is lagging your game I will close and lock your issue because you'll be the 1459th person to tell me about Neruina being lagging.