Sound files in Resources folder cause lag

Hi,

I have an android game with about 50 small .ogg sound files in the Resources folder (total size about 1MB).
I also have an animation (something like an sandglass) that is played while the game is starting up.
The loading of these sound files cause a lag in the start-animation. The animation freezes for a while (actually the complete device freezes). When I delete the sound files, the lag is gone.
Almost all files are Decompress on load and not 3D sounds.

Can I do something about this lag so that I have a start-animation that not freezes?