Why does Chrome's XSL processor validate my XML files when processing them, and how can I make it stop doing that so that it processes them faster?

Dear list,

I have run into a performance issue to which I cannot find the solution.

I have made a couple of changes to my project in the last couple of 
days. The project mainly consists in many small XML files that I write 
with an XML editor but read with a web browser (Chrome). That is, I have 
an XSL stylesheet that transforms these XML files into HTML and which is 
executed by the browser when loading the files. Now, one of the changes 
I made is to switch from a DTD to an XSD for my XML files. And the 
problem is that now the browser loads the files noticeably more slowly. 
Concretely, I see a white screen for a fraction of a second before the 
file is displayed. I am very puzzled by this. I would have thought that 
switching from a DTD to an XSD would not have any effect on the 
performance of the XSL processor because the processor would ignore the 
associated DTD or XSD, respectively. But apparently that is not the 
case. Hence my question: Why does Chrome's XSL processor validate my XML 
files when processing them? I don't understand why it would do that. I 
just want the processor to execute the code, i.e., transform the XML 
into HTML. Also, and more importantly, is there a way -- a line of code 
that I could add to the XSL stylesheet -- that would make it stop 
validating the files and hence process them faster?

Two notes:

1) Since I made several changes to my project, I am not 100 % certain 
that the drop in performance was caused by the switch from DTD to XSD. 
But I think that I have excluded all other possibilities by reversing 
the changes step by step. So I am 95 % certain that this is where the 
problem lies.

2) I could not test the issue with another web browser because Chrome is 
the only browser that I can get to execute the stylesheet at all. All 
other browsers that I have tried refuse to execute the stylesheet on my 
local XML files, supposedly for security reasons.

Thanks in advance for your help!
Wolfhart
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