Eval bug: image encode time slow on mobile device

[perp]

Name and Version

Model:NexaAIDev/OmniVLM-968M
In function clip_image_batch_encode, it takes about 18 seconds to encode the image? far more beyond the llm part ,it task about 1.5 seconds.
ggml_compute_forward compute the model graph about 1102 nodes, how to accelerate?
Deivice: Android, SamSung S23

Operating systems

Other? (Please let us know in description)

GGML backends

CPU

Hardware

Android, SamSung S23

Models

Model:NexaAIDev/OmniVLM-968M

Problem description & steps to reproduce

load time ,encode image too long

First Bad Commit

Relevant log output

no log

[github-actions]

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