Ooops, that does not quite work the way you are expecting it to. color -1 -1 -1 means transparent. so you are rendering the labels but they are just transparent. Since you are rendering the labels, it takes cpu time and it might bump other labels out of the cache. I don't think you really want to do this.
Hey, you're right. I'm glad I mentioned this! You're right, set the labelmaxscale to 1 or some such would be even better.
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