(Using Cholesky factors also requires one backsolve and one forward solve, which is equivalent to two backsolves, no?) It might well be be that Cholesky factorization itself is faster than QR factorization for your sparse matrix, of course.
(Using Cholesky factors also requires one backsolve and one forward solve, which is equivalent to two backsolves, no?) It might well be be that Cholesky factorization itself is faster than QR factorization for your sparse matrix, of course.