How is your experience with performance of ligatures in fonts? I recently tried to create a "meta-font" for Google fonts, which contained a glyph for each font

How is your experience with performance of ligatures in fonts? I recently tried to create a "meta-font" for Google fonts, which contained a glyph for each font displaying the font name in the font's own style. The glyph would be displayed as a ligature if the font name was encountered. This way I could have a list with all font names that would display normally without the meta font available, but with the meta font available, the font names would be displayed in the fonts' own style. I liked this idea a lot, but unfortunately with roughly 1500 ligartures (one for each font on Google fonts) the meta font became much larger than expected and quite slow when used in the browser. Any experiences how many ligartures are fine performance wise?