During the migration from Google's to Microsoft's API, I had to disable 13 languages on my forum; fortunately, these languages weren't very popular among our visitors. They totaled about 50k pageviews, compared to almost 500k pageviews for the other languages combined.
After disabling these languages I immediately observed two things in Google Webmaster Tools:
- 1. The number of pages crawled per day almost doubled
- 2. The average crawl time halved.
I have one of two possible explanations for this: either google's API is slower, or having too many languages simply backfires and it takes away from indexing of your main site content. Thoughts?