Waste Of Time

 

Unlike the Minhag of most Ashkenaz Yidden,the Gaon's Minhag was not to say לדוד ה' אורי  from R. Chodesh Ellul to Simchas Torah.   The אדרת writes the reason for the Gaon was because of טירחא דציבורא.   Saying one extra Kapitel Tehillim takes  up too much time of the ציבור.   Perhaps we can explain the Aderes /Gaon,   There is no mention in Bavli, Yerushalmi, Rishonim, Tur, Shulchan Aruch, Kisvei Arizal, etc.  to say לדוד ה' אורי ( Ellul) The מטה אפרים is the first Halacha Sefer to mention this Minhag. The first to mention to say it בציבור is the Sefer Chemdas Hayomim* & the Sefer Shem Tov Katan who are ספרי קבלה   The Gaon, in general, was against adding additional Tefillos & Pesukim not originating from the אנשי כנסת הגדולה   Wasting one minute of a רבים is multiplied by the number of people in the Minyan    Adding a Kapitel Tehillim which takes to say only one minute can at times be considered taking 100 minutes. (A Shul with 100 מתפללים) This might explain why the Gaon considered it טירחא דציבורא to add לדוד ה' אורי אמבצי   *controversial Sefer