Services are traditional and conducted primarily in Hebrew, with select readings in English. In reality each individual among us knows how he or she best communicates with G‑d. At Chabad the language you use or the pace you set for yourself are not of paramount importance.
Our prayer books are written in both Hebrew and English, and the page numbers are announced continuously so you may always catch up if you prefer to meditate at a slower speed. Connect with the day and with G‑d and with your own soul in whatever personal manner suits you best.
The tunes are old, familiar ones, and they are sung by those of us who know the words and by those of us who can only hum along, with all the gusto befitting the joy of the Sabbath.