Performance Issue after implementataion Row level Secuirty

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.5/static/ddl-rowsecurity.html
Description:

We have implemented Row Level Security feature in postgres database but
database is working very slow after implementation of RLS(Row level
Security) and getting frequent AccessShareLock. we 1.created role.
2.grant permission to table, sequence.
3.enabled row level security and then created policy.