Response time difference between copy and original

I have make an export of my database like that :
EXP system/manager@mybase owner=myowner file=exp_mybase_myowner.dmp
and an import in new session (on same server):
IMP system/manager@mybase2 full=y file=exp_mybase_myowner.dmp
To increase performance of my two databases, i have drop all indexs and recreate them.
But, response time is significantly different between databases.
How can i solve this problem ?

1. Analyze all the tables that are used in your query by using command:
Analyze table <table_name> compute statistics;
You can alsp use package DBMS_STATS.GATHER_DATABASE_STATS to calculate the statistics for all object in DB.
2. Have you checked the DB_BLOCK_SIZE for both the DB? Is it same? Command "SHOW PARAMETER DB_BLOCK
4. Is the SGA size same for both the DB? Command "SHOW SGA"
3. Was there sufficient RAM to create the SGA? I hope you are not using SWAP space for the SGA

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