yesterday i activated onscreen keyboard after notified fcitx process use 2600 Mb of ram so my machine is super slow,but everything is ok when i kill that process,what is this fcxti process and what are the solution for this problem. this was happening since yesterday
This is also happening to me and it is really annoying.
Fcitx is, like ibus, is a keyboard input method system. You can go to gnome-language-selector to see which one you're using. In most cases ibus may be enough and it does no harm to remove fcitx completely.
However I need fcitx but I haven't find a way to deal with that. But at least I answered part of your question.