Loading pages / categories takes a lot of time

*I'm submitting a ...*
- [x] bug report
- [ ] feature request
- [ ] support request

## General infomration

### Prerequisites

* [x] Are you running the latest version?

### Description

Loading pages takes a lot of time. E.g. switching to the next page of search results takes up to 10 secs. Same behavior with searching itself, can take up to 20 secs.

### Steps to Reproduce

Open the Netflix addon and click on any category, or search something.

**Expected behavior:** Loading fast like on every other device

**Actual behavior:** It's loading, but only after a while

## Context (Environment)

### Installation

* [ ] I installed the plugin via zip from the Releases page
* [x] I´m using the Netflix Repo
* [ ] I´m using a different source (Please tell which)

### Operating System

* [ ] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [ ] Windows (x86/x64)
* [x] Linux (ARM)
* [ ] Android

#### Additional informatin on the environment

I'm using Libreelec 18 (build is 3 days old) on a Raspberry Pi 3

## Other information

I'm looking for advice on how to deal with this issue. Has anyone any idea what causes this?
I don't have an idea of what the addon is doing in the background while loading items, but I think it cannot be that much as it's only a simple text list of movies etc.
Could stepping up the CPU frequency help?
Thank you very much and continue your great work!

Reproduce the delay on the Netflix addon using LibreELEC 18 on a Raspberry Pi 3, first checking category navigation, search, and changing search-result pages. Compare the loading time with other devices and identify what work occurs while the list is loading. Done means these operations load substantially faster or the specific bottleneck is documented.

Written by the indexing model from the issue text.