从S3获取3MB文件到MemoryStream耗时过长的问题排查

尝试从S3存储桶获取一个3MB的文件并复制到MemoryStream用于后续查看内容，但调用CopyToAsync时耗时至少1分钟，用传输工具打开流或下载文件耗时相近。

当前代码：

using var s3Object = await _client.GetObjectAsync(getRequest);

var ms = new MemoryStream();

// 耗时极长
await s3Object.ResponseStream.CopyToAsync(ms);

return ms;

我理解s3Object包含该S3对象的元数据以及文件流的起始部分，因此调用CopyToAsync时才会实际完整下载文件。

文件内容示例：

DEPT    .M                                      :1     Index curve
GR      .GAPI                                   :2     L05-07
DT      .US/F                                   :3     L05-07
RHOB    .G/C3                                   :4     L05-07
DRHO    .G/C3                                   :5     L05-07
NPHI    .V/V                                    :6     L05-07
~Ascii Log Data
      63.1000   -999.250000   -999.250000   -999.250000   -999.250000   -999.250000
      63.2000   -999.250000   -999.250000   -999.250000   -999.250000   -999.250000
      63.3000   -999.250000   -999.250000   -999.250000   -999.250000   -999.250000
      63.4000   -999.250000   -999.250000   -999.250000   -999.250000   -999.250000
      63.5000     11.094475   -999.250000   -999.250000   -999.250000   -999.250000
      63.6000     11.473166   -999.250000   -999.250000   -999.250000   -999.250000
      63.7000     12.066418   -999.250000   -999.250000   -999.250000   -999.250000
      63.8000     12.302490   -999.250000   -999.250000   -999.250000   -999.250000
      63.9000     12.272800   -999.250000   -999.250000   -999.250000   -999.250000
      64.0000     11.762026   -999.250000   -999.250000   -999.250000   -999.250000
      64.1000     10.414513   -999.250000   -999.250000   -999.250000   -999.250000
      64.2000      9.588345   -999.250000   -999.250000   -999.250000   -999.250000

请问我的操作是否有误？有没有其他解决方案？

内容的提问来源于stack exchange，提问作者mmgyyc