Notebook performance issues

Is anyone else having performance issues with notebook on a iPhone. I am new to notebook having switched from evernote. I migrated all of my info from evernote and am now learning how to use notebook. I have had to reload the app on my iPhone 6 5 times in order to update my info. Every time that I start the app it is trying to update and it just keeps going and freezes up. I have 118 notebooks over 1900 notes. The iPad and the online version as well as the mac version seem to work fine its just the iPhone version that is not performing well. Any suggestions as to why this is happening? Thanks

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Migrate your Notebook data to the new, mobile Notebook.
Zoho Notebook is transforming. The new version will include exciting new features and a completely new user experience. The initial version will be mobile based, available for Android and iOS. A new web version will be available after the initial mobile release. With the release of the new Notebook approaching, we're migrating most of your current data to the new version. Once the new version is released, there will be an additional window to migrate your data. We will not provide access to the