ROOT's TDataFrame offers a high level interface for analyses of data stored in TTrees.
In addition, multi-threading and other low-level optimisations allow users to exploit all the resources available on their machines completely transparently.
In a nutshell:
ROOT::EnableImplicitMT(); // Tell ROOT you want to go parallel
ROOT::Experimental::TDataFrame d("myTree", "file.root"); // Interface to TTree and TChain
auto myHisto = d.Histo1D("Branch_A"); // This happens in parallel!
myHisto->Draw();Calculations are expressed in terms of a type-safe functional chain of actions and transformations, TDataFrame takes care of their execution. The implementation automatically puts in place several low level optimisations such as multi-thread parallelisation and caching. The namespace containing the TDataFrame is ROOT::Experimental. This signals the fact that the interfaces may evolve in time.