Why the use of package slow down performance ?

Hello everyone,

I use R2009b and I notice a performance problem when doing a "cd" of a directory containing packages...

Any explanation ?

Pierre

See also : http://www.mathworks.com/matlabcentral/answers/57794-why-does-adding-a-class-to-a-package-significant-slow-down-performance

Code:

nbPackages = 10;
rootDir    = pwd;  
mainDir    = fullfile(rootDir, 'test_pkg');

pkgName = mainDir; 
for i=1:nbPackages
    pkgName = fullfile(pkgName, sprintf('+pkg_%d', i));
    mkdir(pkgName);
end

dirName = mainDir; 
for i=1:nbPackages
    dirName = fullfile(dirName, sprintf('dir_%d', i));
    mkdir(dirName);
end

tic, cd(fullfile(mainDir, '+pkg_1')), toc %Elapsed time is 1.073048 seconds.
tic, cd(fullfile(mainDir, 'dir_1')), toc  %Elapsed time is 0.126087 seconds.