The results of the StarImportBenchmark (https://github.com/openrewrite/rewrite/blob/main/rewrite-benchmarks/src/jmh/java/org/openrewrite/benchmarks/java/StarImportBenchmark.java)

noStarImports.txt

Result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport":
  N = 238
  mean =    333.142 ±(99.9%) 10.826 ms/op

  Histogram, ms/op:
    [200.000, 225.000) = 0 
    [225.000, 250.000) = 0 
    [250.000, 275.000) = 19 
    [275.000, 300.000) = 59 
    [300.000, 325.000) = 56 
    [325.000, 350.000) = 30 
    [350.000, 375.000) = 23 
    [375.000, 400.000) = 13 
    [400.000, 425.000) = 22 
    [425.000, 450.000) = 11 
    [450.000, 475.000) = 5 

  Percentiles, ms/op:
      p(0.0000) =    258.212 ms/op
     p(50.0000) =    316.146 ms/op
     p(90.0000) =    410.622 ms/op
     p(95.0000) =    439.511 ms/op
     p(99.0000) =    454.673 ms/op
     p(99.9000) =    459.276 ms/op
     p(99.9900) =    459.276 ms/op
     p(99.9990) =    459.276 ms/op
     p(99.9999) =    459.276 ms/op
    p(100.0000) =    459.276 ms/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.alloc.rate":
  1303.212 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.alloc.rate.norm":
  120516886.531 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.churn.G1_Eden_Space":
  3952.044 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.churn.G1_Eden_Space.norm":
  365663307.976 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.churn.G1_Old_Gen":
  17.500 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.churn.G1_Old_Gen.norm":
  1617624.488 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.churn.G1_Survivor_Space":
  6.259 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.churn.G1_Survivor_Space.norm":
  578827.914 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.count":
  16.000 counts

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.noStarImport:·gc.time":
  549.000 ms


# JMH version: 1.35
# VM version: JDK 11.0.9.1, OpenJDK 64-Bit Server VM, 11.0.9.1+1
# VM invoker: /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/bin/java
# VM options: -javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=51596:/Applications/IntelliJ IDEA.app/Contents/bin -Dfile.encoding=UTF-8
# Blackhole mode: full + dont-inline hint (auto-detected, use -Djmh.blackhole.autoDetect=false to disable)
# Warmup: 2 iterations, 10 s each
# Measurement: 2 iterations, 10 s each
# Timeout: 10 min per iteration
# Threads: 4 threads, will synchronize iterations
# Benchmark mode: Sampling time
# Benchmark: org.openrewrite.benchmarks.java.StarImportBenchmark.starImport

# Run progress: 50.00% complete, ETA 00:00:46
# Fork: 1 of 1
# Warmup Iteration   1: 1076.906 ±(99.9%) 404.676 ms/op
# Warmup Iteration   2: 451.053 ±(99.9%) 38.826 ms/op
Iteration   1: 341.827 ±(99.9%) 18.419 ms/op
                 starImport·p0.00:                 261.882 ms/op
                 starImport·p0.50:                 329.253 ms/op
                 starImport·p0.90:                 437.990 ms/op
                 starImport·p0.95:                 470.706 ms/op
                 starImport·p0.99:                 484.547 ms/op
                 starImport·p0.999:                485.491 ms/op
                 starImport·p0.9999:               485.491 ms/op
                 starImport·p1.00:                 485.491 ms/op
                 ·gc.alloc.rate:                   1278.330 MB/sec
                 ·gc.alloc.rate.norm:              119955428.098 B/op
                 ·gc.churn.G1_Eden_Space:          3830.174 MB/sec
                 ·gc.churn.G1_Eden_Space.norm:     359414342.764 B/op
                 ·gc.churn.G1_Old_Gen:             17.066 MB/sec
                 ·gc.churn.G1_Old_Gen.norm:        1601431.935 B/op
                 ·gc.churn.G1_Survivor_Space:      32.705 MB/sec
                 ·gc.churn.G1_Survivor_Space.norm: 3069002.927 B/op
                 ·gc.count:                        17.000 counts
                 ·gc.time:                         770.000 ms

Iteration   2: 315.808 ±(99.9%) 12.459 ms/op
                 starImport·p0.00:                 235.930 ms/op
                 starImport·p0.50:                 313.524 ms/op
                 starImport·p0.90:                 372.140 ms/op
                 starImport·p0.95:                 386.872 ms/op
                 starImport·p0.99:                 409.993 ms/op
                 starImport·p0.999:                409.993 ms/op
                 starImport·p0.9999:               409.993 ms/op
                 starImport·p1.00:                 409.993 ms/op
                 ·gc.alloc.rate:                   1375.197 MB/sec
                 ·gc.alloc.rate.norm:              119931837.191 B/op
                 ·gc.churn.G1_Eden_Space:          4046.131 MB/sec
                 ·gc.churn.G1_Eden_Space.norm:     352865834.992 B/op
                 ·gc.churn.G1_Old_Gen:             17.514 MB/sec
                 ·gc.churn.G1_Old_Gen.norm:        1527381.985 B/op
                 ·gc.churn.G1_Survivor_Space:      6.425 MB/sec
                 ·gc.churn.G1_Survivor_Space.norm: 560307.786 B/op
                 ·gc.count:                        16.000 counts
                 ·gc.time:                         870.000 ms

starImports.txt

Result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport":
  N = 242
  mean =    328.387 ±(99.9%) 11.178 ms/op

  Histogram, ms/op:
    [200.000, 225.000) = 0 
    [225.000, 250.000) = 1 
    [250.000, 275.000) = 33 
    [275.000, 300.000) = 54 
    [300.000, 325.000) = 36 
    [325.000, 350.000) = 45 
    [350.000, 375.000) = 35 
    [375.000, 400.000) = 11 
    [400.000, 425.000) = 13 
    [425.000, 450.000) = 4 
    [450.000, 475.000) = 6 

  Percentiles, ms/op:
      p(0.0000) =    235.930 ms/op
     p(50.0000) =    323.748 ms/op
     p(90.0000) =    403.282 ms/op
     p(95.0000) =    436.208 ms/op
     p(99.0000) =    478.219 ms/op
     p(99.9000) =    485.491 ms/op
     p(99.9900) =    485.491 ms/op
     p(99.9990) =    485.491 ms/op
     p(99.9999) =    485.491 ms/op
    p(100.0000) =    485.491 ms/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.alloc.rate":
  1326.763 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.alloc.rate.norm":
  119943632.644 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.churn.G1_Eden_Space":
  3938.152 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.churn.G1_Eden_Space.norm":
  356140088.878 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.churn.G1_Old_Gen":
  17.290 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.churn.G1_Old_Gen.norm":
  1564406.960 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.churn.G1_Survivor_Space":
  19.565 MB/sec

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.churn.G1_Survivor_Space.norm":
  1814655.357 B/op

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.count":
  16.500 counts

Secondary result "org.openrewrite.benchmarks.java.StarImportBenchmark.starImport:·gc.time":
  820.000 ms


# Run complete. Total time: 00:01:32

REMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on
why the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial
experiments, perform baseline and negative tests that provide experimental control, make sure
the benchmarking environment is safe on JVM/OS/HW level, ask for reviews from the domain experts.
Do not assume the numbers tell you what you want them to tell.

Benchmark                                                            Mode  Cnt          Score    Error   Units
StarImportBenchmark.noStarImport                                   sample  238        333.142 ± 10.826   ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.00                sample             258.212            ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.50                sample             316.146            ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.90                sample             410.622            ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.95                sample             439.511            ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.99                sample             454.673            ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.999               sample             459.276            ms/op
StarImportBenchmark.noStarImport:noStarImport·p0.9999              sample             459.276            ms/op
StarImportBenchmark.noStarImport:noStarImport·p1.00                sample             459.276            ms/op
StarImportBenchmark.noStarImport:·gc.alloc.rate                    sample    2       1303.212           MB/sec
StarImportBenchmark.noStarImport:·gc.alloc.rate.norm               sample    2  120516886.531             B/op
StarImportBenchmark.noStarImport:·gc.churn.G1_Eden_Space           sample    2       3952.044           MB/sec
StarImportBenchmark.noStarImport:·gc.churn.G1_Eden_Space.norm      sample    2  365663307.976             B/op
StarImportBenchmark.noStarImport:·gc.churn.G1_Old_Gen              sample    2         17.500           MB/sec
StarImportBenchmark.noStarImport:·gc.churn.G1_Old_Gen.norm         sample    2    1617624.488             B/op
StarImportBenchmark.noStarImport:·gc.churn.G1_Survivor_Space       sample    2          6.259           MB/sec
StarImportBenchmark.noStarImport:·gc.churn.G1_Survivor_Space.norm  sample    2     578827.914             B/op
StarImportBenchmark.noStarImport:·gc.count                         sample    2         32.000           counts
StarImportBenchmark.noStarImport:·gc.time                          sample    2       1098.000               ms
StarImportBenchmark.starImport                                     sample  242        328.387 ± 11.178   ms/op
StarImportBenchmark.starImport:starImport·p0.00                    sample             235.930            ms/op
StarImportBenchmark.starImport:starImport·p0.50                    sample             323.748            ms/op
StarImportBenchmark.starImport:starImport·p0.90                    sample             403.282            ms/op
StarImportBenchmark.starImport:starImport·p0.95                    sample             436.208            ms/op
StarImportBenchmark.starImport:starImport·p0.99                    sample             478.219            ms/op
StarImportBenchmark.starImport:starImport·p0.999                   sample             485.491            ms/op
StarImportBenchmark.starImport:starImport·p0.9999                  sample             485.491            ms/op
StarImportBenchmark.starImport:starImport·p1.00                    sample             485.491            ms/op
StarImportBenchmark.starImport:·gc.alloc.rate                      sample    2       1326.763           MB/sec
StarImportBenchmark.starImport:·gc.alloc.rate.norm                 sample    2  119943632.644             B/op
StarImportBenchmark.starImport:·gc.churn.G1_Eden_Space             sample    2       3938.152           MB/sec
StarImportBenchmark.starImport:·gc.churn.G1_Eden_Space.norm        sample    2  356140088.878             B/op
StarImportBenchmark.starImport:·gc.churn.G1_Old_Gen                sample    2         17.290           MB/sec
StarImportBenchmark.starImport:·gc.churn.G1_Old_Gen.norm           sample    2    1564406.960             B/op
StarImportBenchmark.starImport:·gc.churn.G1_Survivor_Space         sample    2         19.565           MB/sec
StarImportBenchmark.starImport:·gc.churn.G1_Survivor_Space.norm    sample    2    1814655.357             B/op
StarImportBenchmark.starImport:·gc.count                           sample    2         33.000           counts
StarImportBenchmark.starImport:·gc.time                            sample    2       1640.000               ms

nice work