We show that the modulus of continuity of the SLE$_4$ uniformizing map is given by $(\log δ^{-1})^{-1/3+o(1)}$ as $δ\to 0$. As a consequence of our analysis, we show that the Jones-Smirnov condition for conformal removability (with quasihyperbolic geodesics) does not hold for SLE$_4$. We also show that the modulus of continuity for SLE$_8$ with the capacity time parameterization is given by $(\log δ^{-1})^{-1/4+o(1)}$ as $δ\to 0$, proving a conjecture of Alvisio and Lawler.