Alternative to Dynamic SQL in Trigger

Dear Experts,

I have a scenario where the trigger converts rows to columns. There are about 70 known columns in the target table.

Our client wants real time replication using SLT . I used INSERT with CASE and UPDATE with CASE to identify the columns and their corresponding values. It takes about 2 minutes to update 10000 records but the target is 3 - 4 seconds to achieve the same.

I also tried using Dynamic SQL to identify columns but Unfortunately it is not supported.

Any suggestions to optimize the performance ??????