It doesn't make much difference because the the way FastTrack works. After it is activated only sporadic traffic is sent through the normal rules.
Have also a look at notrack in RAW which speeds up traffic by bypassing the connections table.
Two RB760iGS (hEX S) in series. One does PPPoE and both do IKEv2.
Running: RouterOS 6.47.beta.x / Winbox 3.21 / MikroTik APP 1.3.12
NordVPN viewtopic.php?f=2&t=158439&p=781009 for multiple connections.