如何在TPL数据流中执行异步操作以获得最佳性能？

I wrote the following method to batch process a huge CSV file. The idea is to read a chunk of lines from the file into memory, then partition these chunk of lines into batches of fixed size. Once we get the partitions, send these partitions to a server (sync or async) which might take a while.I wrote the following method to batch process a