Precompilation can be used to speed up compilation of
templates. It is only necessary to run precompile() once,
typically right after installation of TMB. The function
prepares TMB for precompilation, while the actual
pre-compilation takes place the first time you compile a model
after running precompile().
Note that the precompilation requires write access to the TMB
package folder. Three versions of the library will be prepared:
Normal, parallel and a debugable version.
Precompilation works the same way on all platforms. The only known
side-effect of precompilation is that it increases the file size
of the generated binaries.