Byte compilation of packages on CRAN

In DESCRIPTION if I set LazyLoad to 'yes' will data.table (for example)
then be byte compiled for users who install the binary package from CRAN
on Windows?
No.  LazyLoad is distinct from byte compilation.  All installed packages 
use lazy loading these days (for simplicity: a very few do not benefit 
from it as they use all their objects at startup).
This question is based on reading section 1.2 of this document :
http://www.divms.uiowa.edu/~luke/R/compiler/compiler.pdf
I've searched r-devel and Stack Overflow history and have found
questions and answers relating to R CMD INSTALL and install.packages()
from source, but no answer (as yet) about why binary packages for
Windows appear not to be byte compiled.
If so, is there any reason why all packages should not set LazyLoad to
'yes'. And if not, could LazyLoad be 'yes' by default?
I wonder why you are not reading R's own documentation.  'Writing R 
Extensions' says

'The `LazyData' logical field controls whether the R datasets use 
lazy-loading. A `LazyLoad' field was used in versions prior to 2.14.0, 
but now is ignored.

The `ByteCompile' logical field controls if the package code is 
byte-compiled on installation: the default is currently not to, so this 
may be useful for a package known to benefit particularly from 
byte-compilation (which can take quite a long time and increases the 
installed size of the package).'

Note that the majority of CRAN packages benefit very little from 
byte-compilation because almost all the time of their computations is 
spent in compiled code.  And the increased size also may matter when the 
code is loaded into R.
Thanks,
Matthew

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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Byte compilation of packages on CRAN

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