How An Old Pentium 4 System Runs With Ubuntu 10.04, 10.10
While the benchmarks exhibiting performance changes up to this point were regressions that negatively impacted the systen's performance, with PostMark since the move to EXT4 the results are dramatically better.
The Gcrypt CAMELLIA256-ECB cipher performance degraded slightly between the last two Ubuntu Long-Term Support (LTS) releases.