Execution time of called method from custom shared variable classes

Hi,

I need to find out execution time of some class called from the template. It's the class with bunch of static methods and I would ideally need to know cumulative time spent in all those calls (as opposed to rendering itself). The examples of usages would be from

${classX.callA(some param)} 

to

[#if classX.doTest() ]

etc.

The class above is made available via shared variables.

I understand that I need to modify the code was wondering if anyone could suggest what would be the best class to extend to add such monitoring and to collect the time. 
Is there a singe point through which all calls to shared variable methods go?
Is TemplateMethodModel.exec() the right place where to measure such thing or do I need to extend more (or something else then model) depending on where the call happens?

Thanks in advance,
--
Jan

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