# Quiz

+ What are the possible reasons for slow transaction response times?
  + `A` . Lock request and lock waits
  + `B` . TiDB performance issues
  + `C` . Application performance issues
  + `D` . Proxy or LB performance issues

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1. What are the possible reasons for slow transaction response times? (a, b, c, d)
  1. Lock request and lock waits
  2. TiDB performance issues
  3. App performance issues 
  4. Proxy or LB performance issues