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https://issues.apache.org/jira/browse/LUCENENET-647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17054750#comment-17054750
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Shad Storhaug commented on LUCENENET-647:
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Thanks for the report.
However, without more information there isn't much we can do on our end.
Specifically, what is slow? Searching, indexing, analyzing?
Without seeing some code, it is hard to put together any advice on what to do
about it. Could you please provide a sample configuration that runs fast in
Lucene.NET 3.0.3 and is measurably slower when running with Lucene.NET 4.8.0?
Also, can you please confirm you are using 4.8.0-beta00007? It has several
performance improvements over the previous betas.
[~eladmarg] - Yes, there are some additional performance improvements in the
trunk that haven't been released yet. Most of them only apply to very specific
configurations, though. I am hoping to eliminate the "Support" namespace on
ICU4N before doing that release.
> Performance decreasement migrating from 3.0.3 to 4.8.0
> ------------------------------------------------------
>
> Key: LUCENENET-647
> URL: https://issues.apache.org/jira/browse/LUCENENET-647
> Project: Lucene.Net
> Issue Type: Improvement
> Environment: OS: Windows 10
> CPU: Intel Core i7-8700
> RAM: 32Gb
> Reporter: Mo Dje
> Priority: Major
>
> Hello,
> I'm currently migrating a project, that uses Lucene.Net, from .Net Framework
> to .Net Core.
> I had to migrate from 3.0.3 version of Lucene to 4.8.0 (beta0007) but I
> noticed performance decreasement while measuring response time while
> requesting the database. The response time using Lucene 4.8.0 is two to three
> times higher than 3.0.3 version.
> I read some forum topics where other users noticed this performance
> decreasement too. Are you aware about that? Do you plan to do something to
> improve performances of Lucene 4.8.0?
> Best regards
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