Why is my Dataplugin slower than the wizard dataplugin

I've attached my Dataplugin. It works, does a good job, but to do effectively the same thing with a wizard creadted dataplugin, this seems to take many times longer. What I can't do in the wizard is the date/time combining, and I'm hoping to add more features to this plugin anways.

Now, one thing I've noticed, is I get little red icons next to my files now rather than a little txt document icon. Is there some pre-processing done by the navigator when the wizard is employed that isn't being done now, and now its doing everything at once?

Yes, the data is large, about 172000 lines of 50 channels in each file.

Thanks.

--Scott