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This thread is resolved. Here is a description of the problem and solution.
Problem: The user would like to cleanup WordPress tables from revisions to gain performances and asks if it will be ok with WPML. Solution: WPML offers it own cleanup tools in WPML->Support->Troubleshooting->Cleanup You can also be safely delete the revisions from WPML perspective. Here some plugins and articles that might be interesting for you: => http://wordpress.org/plugins/better-delete-revision/ => http://wordpress.org/plugins/rvg-optimize-database/ => https://wordpress.org/plugins/delete-post-revisions-by-tricks-panda/
Regarding WPML performance, here are articles that might help: => http://wpml.org/2012/01/can-your-site-run-faster/ => http://wpml.org/faq/why-string-translation-appears-to-slow-down-sites/ => http://wpml.org/faq/how-to-optimize-mysql-queries/ => http://wpml.org/2011/03/wpml-with-w3tc/