Is Quarkus rest client parallel connections limited to 256

Question

I have a client to request remote server

Multi.createFrom()
      .items(
          userInfoList.stream())
      .onItem()
      .transformToUniAndMerge(
           userInfo -> {
              System.out.println( personInfo.toString() );
              restClientService.aRESTClientService( userInfo );
           }
      )

rest client :

@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
@Path("/xxx")
@RegisterRestClient
public interface RestClientService {
    @GET
    @Path("/xxxx")
    Uni<ResultDto<String>> aRESTClientService(UserInfo userInfo);
}

am I doing something wrong ? or is there something that can be configured