\[ y'(x)=\frac {1}{3} x \left (3 x \sqrt {x^2+3 y(x)}-2\right ) \] ✓ Mathematica : cpu = 0.121572 (sec), leaf count = 31
\[\left \{\left \{y(x)\to \frac {1}{12} \left (-6 c_1 x^3+9 c_1^2+x^6-4 x^2\right )\right \}\right \}\]
✓ Maple : cpu = 0.219 (sec), leaf count = 22
\[ \left \{ {\it \_C1}+{\frac {{x}^{3}}{2}}-\sqrt {{x}^{2}+3\,y \left ( x \right ) }=0 \right \} \]