- CL-CSV - CL-CSV is a library to parse and write csv (comma-separated-values) files
 - cl-sgdos-csv - cl-sgdos-csv is a library for mapping CSV files to LISP lists and CLOS objects and viceversa.
 - CSV (library) - The CSV library, authored by Jeffrey Massung, permits reading and writing comma-separated-values (CSV) files
 - dso-csv - A very simple parser for the CSV (comma-separated values) file format
 - fare-csv - fare-csv is a library for reading and writing CSV files
 - persistent-variables - Persistent-variables is a convenience library that makes it easy to serialize and deserialize variables
 - picard-csv-parser - picard-csv-parser is a CSV file format reader/writer
 - read-csv - Read-csv is a library for reading csv (comma-separated-values) files
 
csv
These are the list of csv (comma-separated-values)  parsing/writing libraries.
There are no currently recommended library.
Someone should do the performance test on these.