I'm not 100% sure I'm understanding how you are toggling. One track is normal, the other is muted and you solo that track?
Are there any plugins that cause delay involved on either track or the master track?
Muting has a little more going on in terms of how it interacts with CPU, from what I understand, in certain circumstances it can (I believe) change the state of processing for plugins, whereas soloing does not actually affect other tracks. Again I'm not entirely sure of this, but that's what I recall.
So you may instead want to try grouping the solo buttons of the two tracks so that they are opposite of each other. This is done by right clicking the tracks with both selected and opening Track grouping parameters. Enable both master and slave for Solo for this goup.
Now you can shift click the solo button on one of the tracks to turn it on separately from grouping, after which a regular click will turn off solo for that track but enable it on the other.
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