It may not in your case where the bottleneck is more likely to be your upload/download bandwidth on the Talk server or that of those participating (other countries, on 3g etc.). Turn server resolves connectivity issues re accessibility not so much performance although it may help in some cases.
Unless you have a lot of bandwidth and CPU capacity across all participating devices you are not going to get a stable conference call with perhaps 3 users which is the best I could achieve on a home server with Talk. A quick browse through the forum shows that other are experiencing similar behaviour.
If you really keen to have conferences with more than 3 users have a look at the threads for Jitsi (Jitsi Integration in Nextcloud Talk) or BBB (Nextcloud App for BigBlueButton integration). I understand the latter requires a solid server but has very nice functionality beyond just conferences. Jitsi is a bit more straightforward for just conferences.
Hope that helps.