A new study conducted on May 9, 2018, by AV-Comparatives, ranked the most widely used antivirus programs on the market in terms of time to delay the performance of your system, for computers running Windows 10.
The test was performed on a Lenovo G50 powered by an Intel Core i3 chip, 4GB of RAM and a hard drive. The operating system was Windows 10, with the Fall Creators Update version and all the applications were installed with their default settings. 
AV-Comparatives performed a number of tasks such as copying files, archiving and removing files, installing and uninstalling applications,movement προγραμμάτων, λήψη αρχείων, περιήγηση σε ιστοσελίδες και την PCMark 10 application as reference.
Η χειρότερη απόδοση καταγράφηκε κατά τη δοκιμή του Windows Defender της Microsoft, το οποίο έρχεται προεγκατεστημένο στα Windows 10. Το Windows Defender προκάλεσε σημαντική πτώση στην απόδοση κατά την αντιγραφή αρχείων και την εγκατάσταση εφαρμογών, με την μικρότερο πτώση να σημειώνεται κατά τη duration of downloading files. Microsoft's security solution achieved 96,7 points in the PCMark 10 score, which is not as good as Avira's 99,4 points, but not as bad as Quick Heal's 95,2 points.
Overall, Windows Defender solemnly finished in last place, while K7, ESET, Avast, AVG, Bitdefender and Kaspersky received the best results.
According to the research, the majority of antivirus solutions, barely affected performance when browsing websites or copying files, but the biggest slowdown was recorded when launching applications for the first time. Products of Tencent companies, Trend Micro, Emsisoft and VIPRE slow down systems when new applications are first run.
In a related note, AV-Comparatives states that "although we report the results for the first opening of an application as well as for subsequent openings, we consider subsequent openings more important, since this operation is performed several times by users".
Keep in mind that this research was conducted with a low-end device, so the impact on performance may be significantly smaller in the case of a computer with newer hardware and SSDs.
