BitDefender is a very performant security software suite. It has the best virus detection rate for 5 years now.
Bitdefender is a Top Rated Product this year, with joint highest scores overall. It only missed Product of the Year because it won the award last year; it received Advanced+ awards in all eight main tests. It wins the Gold Award in Proactive Protection, joint Gold in File Detection, joint Gold in the Real-World Protection Test, and joint Silver in Malware Removal. Its almost instant real-time detection of malware on a flash drive stood out in our user-experience review.
In the latest Real-World Protection Test (Mail 2016) BitDefender ranked first with 0 false-positive and blocked 100% of the threats. It also ranked first in the last Heuristic Behavioural Test (March 2015) with 99% blocked. Regarding the performance, it does not slow-down your computer, with an low impact of only 0.4 points, faster than Avast (0.5 points), AVG (7.5 points) and McAfee (12.5 points).
Source: AV-Comparatives 2016