Vollmer, AdrianAdrianVollmerAmendola, LucaLucaAmendolaCatena, RiccardoRiccardoCatena2020-12-102020-12-1020162470-0010https://resolver.sub.uni-goettingen.de/purl?gro-2/75631The time renormalization group (TRG) is an effective method for accurate calculations of the matter power spectrum at the scale of the first baryonic acoustic oscillations. By using a particular variable transformation in the TRG formalism, we can reduce the 2D integral in the source term of the equations of motion for the power spectrum into a series of 1D integrals. The shape of the integrand allows us to precompute only 13 antiderivatives numerically, which can then be reused when evaluating the outer integral. While this introduces a few challenges to keep numerical noise under control, we find that the computation time for nonlinear corrections to the matter power spectrum decreases by a factor of 50. This opens up the possibility to use TRG for mass production as in Markov chain Monte Carlo methods. A FORTRAN code demonstrating this new algorithm is publicly available.enjournal_article10.1103/PhysRevD.93.0435260003702476000072470-0029