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Charged particle reconstruction in the presence of many simultaneousproton-proton $pp$ collisions in the LHC is a challenging task for the ATLASexperiment's reconstruction software due to the combinatorial complexity. Thispaper describes the major changes made to adapt the software to reconstructhigh-activity collisions with an average of 50 or more simultaneous $pp$interactions per bunch crossing (pile-up) promptly using the availablecomputing resources. The performance of the key components of the trackreconstruction chain and its dependence on pile-up are evaluated, and theimprovement achieved compared to the previous software version is quantified.For events with an average of 60 $pp$ collisions per bunch crossing, theupdated track reconstruction is twice as fast as the previous version, withoutsignificant reduction in reconstruction efficiency and while reducing the rateof combinatorial fake tracks by more than a factor two.

Software Performance of the ATLAS Track Reconstruction for LHC Run 3