Good evening! I have a similar problem: Warning: Table wpmu_icl_translate has very many rows (880097)...
+ Set Language information
+ Clear Cache in WPML
+ Fix element types collation
+ Assign translation status to duplicated content
+ Remove ghost entries from the translation tables
These solutions did not help me. Are there any other options? I have only 27 tours and about 20 pages on the site, two active languages and 7 more inactive. Thanks