It happened all the time. I've played plenty of D3D11 games where clicking to shoot my gun would stutter the first time it happened as it was compiling shaders

It happened all the time. I've played plenty of D3D11 games where clicking to shoot my gun would stutter the first time it happened as it was compiling shaders for the bullet fire particle effects. Driver caches mean that after everything gets "prewarmed", it won't happen again.