Translation:You are slow, just like a turtle.
Here is an article in Dutch http://taaladvies.net/taal/advies/vraag/1336/als_zoals/ on Als vs Zoals. If there is a pause before the conjunction, as in "huisdieren, zoals katten and honden", it is represented by a comma or dash. Everything between dashes and commas can be omited in principle and can be paraphrased with "for example". In such cases "zoals" is strongly preferred.
If there is no pause, then no delimiting commas or dashes, as in "huisdieren (zo)als katten en honden". In such cases that information cant be omitted and Als can be used, but zoals is possible too.