AWS Graviton2 builds are slower compared to old Travis implementation

Hi,

I’m not seeing the expected behavior of quicker build times using the new AWS Graviton implementation and im wondering if im missing something.

The Graviton builds are consistently slower - please see the following link to the CI Build History

Travis CI Build History : https://travis-ci.com/github/cmccarthyIrl/spring-cucumber-test-harness

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Travis AWS quickest build : https://travis-ci.com/github/cmccarthyIrl/spring-cucumber-test-harness/builds/191549414 1m 42 sec (inconsistent +12s on average)
Travis AWS longest build : https://travis-ci.com/github/cmccarthyIrl/spring-cucumber-test-harness/builds/191545838 2m 14 sec

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Travis old implementation quickest build : https://travis-ci.com/github/cmccarthyIrl/spring-cucumber-test-harness/builds/191549414 1m 40 sec (consistent +6s on average)
Travis old implementation longest build : https://travis-ci.com/github/cmccarthyIrl/spring-cucumber-test-harness/builds/191552797 1m 46 sec

Seen the same here. Adding pip cache sped the build up a lot as we never had that before but I’m sure that’s not supposed to be needed.

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