I'm experiencing too long build times due to ImportScanner scanMissingModules

Hi everyone !

I have updated lately to the last version of Meteor and I’m experiencing long building times, the most important related to ImportScanner#scanMissingModules in bundler.bundle…makeClientTarget
Does anybody know how to reduce this times ?

Thank you for your help

|    ├─ bundler.bundle..makeClientTarget.......................91,937 ms (2)
|    │  └─ Target#make.........................................91,936 ms (2)
......
|    │     ├─ Target#_emitResources............................90,192 ms (2)
|    │     │  ├─ PackageSourceBatch.computeJsOutputFilesMap....86,265 ms (2)
.......
|    │     │  │  ├─ ImportScanner#scanMissingModules for the app.72,510 ms (4)
|    │     │  │  │  ├─ ImportScanner#resolve...................20,468 ms (74592)
|    │     │  │  │  │  ├─ files.stat                            7,328 ms (46718)
|    │     │  │  │  │  ├─ safeWatcher.watch.....................8,696 ms (73447)
|    │     │  │  │  │  │  ├─ files.stat                         6,109 ms (46375)
|    │     │  │  │  │  │  ├─ files.watchFile                    1,596 ms (73447)
|    │     │  │  │  │  │  └─ other safeWatcher.watch              991 ms
.....
|    │     │  │  │  ├─ ImportScanner#realPath...................3,174 ms (26787)
|    │     │  │  │  │  ├─ safeWatcher.watch.......................586 ms (40781)
|    │     │  │  │  │  │  ├─ files.watchFile                      359 ms (40781)
|    │     │  │  │  │  │  └─ other safeWatcher.watch              227 ms
|    │     │  │  │  │  ├─ optimistic lstat........................477 ms (20114)
|    │     │  │  │  │  │  └─ files.lstat                          417 ms (20114)
|    │     │  │  │  │  ├─ shouldWatch                             303 ms (20113)
|    │     │  │  │  │  └─ other ImportScanner#realPath          1,807 ms
.....
|    │     │  │  │  ├─ ImportScanner#readFile...................8,235 ms (26789)
.....
|    │     │  │  │  │  ├─ optimistic readFile...................4,816 ms (19347)
|    │     │  │  │  │  │  └─ files.readFile                     4,741 ms (19347)
|    │     │  │  │  │  ├─ optimistic hashOrNull.................1,462 ms (19347)
...
|    │     │  │  │  │  └─ other ImportScanner#readFile          1,459 ms
|    │     │  │  │  ├─ DefaultHandlers.js.......................9,457 ms (26769)
|    │     │  │  │  │  ├─ reifyCompileWithCache.................9,118 ms (26595)
|    │     │  │  │  │  │  ├─ files.readFile                     8,640 ms (26539)
|    │     │  │  │  │  │  └─ other reifyCompileWithCache          479 ms
|    │     │  │  │  │  └─ other DefaultHandlers.js                339 ms
|    │     │  │  │  ├─ ImportScanner#findImportedModuleIdentifiers 28,360 ms (26789)
|    │     │  │  │  └─ other ImportScanner#scanMissingModules for the app 2,434 ms
....