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The accurate description of non-ideal quantum many-body systems is of primeimportance for a host of applications within physics, quantum chemistry,material science, and related disciplines. At finite temperatures, the goldstandard is given by \textit{ab initio} path integral Monte Carlo (PIMC)simulations, which do not require any empirical input, but exhibit anexponential increase in the required compute time for fermionic systems withincreasing the system size $N$. Very recently, it has been suggested to computefermionic properties without this bottleneck based on PIMC simulations offictitious identical particles. In the present work, we use this technique tocarry out very large ($N\leq1000$) PIMC simulations of the warm dense electrongas and demonstrate that it is capable of providing a highly accuratedescription of investigated properties, i.e., the static structure factor, thestatic density response function, and local field correction, over the entirerange of length scales.

Ab initio path integral Monte Carlo simulations of the uniform electron gas on large length scales