How crowded is Sydney Airport these days?

I am flying on board a Scoot flight to Kaohsiung via Singapore tonight. I was wondering if it'll be enough time to get to the airport three hours before the flight.

3hr is plenty in evening, use to do it regularly when flying HA

just last Friday I flew Sydney to Christchurch on the evening 5:45pm Qantas flight. I arrived around 2hr 30mins prior to departure and there was no wait at all. 

Thank you both! I was afraid that there'd be increased security measures given the recent events.

With an LCC (who typically staff checkin thinly) I'd arrive 3.5+hrs early or 2hrs early - otherwise you will likely be in a longish queue

LCC's are a different story as the lines tend to be very long - due to no Status priority check-in for economy as with all other full carrier airlines. So basically unless you're travelling business EVERYONE checks in via the economy line.

Reporting from gate lounge 51, immigration and security were both quick. Hardly any queue at all. 

Great to see they have direct flights to Kaohsiung from Singapore again, it is good to know. It used to be a pain to go to Taipei and then down on the fast rail.